Starting at about 3:33, a Big Muff can be seen at Ty's feet

In the video "Arctic Monkeys - Balaclava + Fake Tales Of San Francisco (Live Rock Am Ring 2007)" on YouTube, it is visible that Nick O'Malley uses the Electro-Harmonix Big Muff Pi during the band's 2007 tour performances. This can be seen 13 seconds in.

Visible in a couple of photos featured on Kit Rae's Big Muff Pi Page. The other one, a still from Beck's From The Basement performance, can be seen here.

Shown above, left to right: Flea's (Red Hot Chili Peppers) pedal board with V9 Muff, Mudhoney's Big Muff, and two shots of Beck's Big Muff .

Mentioned in this January 2005 Guitar World interview and two Premier Guitar interviews.

Guitar World, January 2005, pgs. 45-46 "Ace Frehley" (a Russian translation can be found here)

What effect are you using on the solo in "Strange Ways"? I love that sound.

—Roy "Snake" Helvenstine Jr.

That was a heavy distortion unit–probably a Big Muff or a Fuzz Face–and a Marshall amp on 10. I usually performed my solos from the control room, with my amp out in the studio. But for "Strange Ways," I stood in front of the amp, which is how I got all the crazy feedback.

(...) You have a great sound. What pickups do you use, and what is in your pedalboard?

—Vince Applegate

I don't have a pedalboard because I trip over them with my boots on. I have a rack under the stage that my roadie controls. It has different gear in it at different times, although it always has an MXR graphic equalizer, a Big Muff and a power booster. The last few tours I also had a Line 6 Pod. But the real key to my sound is that I always blend three sounds: usually my rackmount, my Marshall and another Marshall with a sealed cab and a Celestion 12-inch speaker with a mic inside. On the last leg of the most recent tour, I started using a Peavey 5150. I use DiMarzio Super Distortion custom-made pickups.

Premier Guitar, "Ace Frehley: Navigating with the Spaceman", March 11, 2010

According to the man himself, Ace’s rig both onstage and in the studio has always been relatively straightforward:

“On the early Kiss records, I used my tobacco sunburst Gibson Les Paul Standard with a rewound hot pickup, through a Marshall stack or old Fender tweed amp, on most of the studio recordings. I used an Electro-Harmonix Big Muff to overdrive them sometimes. Later, I got a cherry sunburst Les Paul Custom and an old ’59 Les Paul Standard, which dominated my studio recordings in the late ‘70s. My 1978 solo album, Ace Frehley, really shows off what a Les Paul guitar can do in the studio. I recorded almost the whole album exclusively with my 1959 vintage sunburst Les Paul. I use Gibson Les Paul Customs live because they’re simply the best guitars for loud rock ‘n’ roll. I’ve always said, ‘Just plug a Les Paul into a Marshall amp and turn it up to 10!’ It’s a no-brainer.”

Premier Guitar, "Ace Frehley: Cosmic Space Invasion", September 2, 2014

What sounds are you using from the G3?

I like the tape delay effect and the Big Muff sound, because I used a Big Muff years ago. In general though, I try to stay away from effects as much as I can.

Used by Head on "Blind" and "Shoots and Ladders".

In this YouTube short, Hozier shares some gear he uses making demos and writing songs, and shows off his pedalboard. He shows his Big Muff pedal and adds an open caption saying "Big Muffs and Tube Screamers"

Used on Garlands, as specified in the Equipment Notes section of Guthrie's official website (now hosted on the Cocteau Twins website). It is also mentioned in this September 3, 2010 Harmony Central forum post by user OrangeLazarus.

Equipment Notes

“The recording of ‘Blind Dumb Deaf’ was a little different to most of the later Cocteau Twins songs as it was our first album, we were studio newbies and didn't have the time or experience to experiment at all during the recording process. I wasn't really the producer (I didn't even know what a producer was at that point) so all the work on guitar sounds as such was done before the band entered the studio from playing gigs and gathering what equipment we could. Garlands, the album, was essentially recorded live in the studio with myself and Will playing together and Elizabeth over-dubbing a few vocals later, very much the way most bands record. My guitar setup was this: a Kawai KS-11-XL electric guitar followed by an Electro-Harmonix Big Muff Pi, a Watkins Copicat tape echo (3 button model), an Electro-Harmonix Clone Theory and then into another Watkins Copicat tape echo (4 button model) - this went into my amp, a Maine combo (60w 2x10 never seen one since). The bass was a Rickenbacker 4001 played through a Ibanez UE-400 Multi-Effects unit into a Carlsbro Stingray bass combo. There was one disappointment at the time which was the drum machines that we used, a Boss Dr Rhythm and a Soundmaster SR88 played through the distortion channel of a HH IC100 combo were deemed unsuitable by the engineers and Ivo (the grown-ups) and were replaced with the ‘more professional’ (at the time as it had just been invented) Roland TR808. This made the drums sound very clean but weak, lacking the power that we were used to in concert. I mean the stuff we used sounded way more like (what became) hip-hop than electronic. But in spite of the lack of distortion on the drums the ‘Garlands’ sessions were a pretty accurate recording of how we sounded at the time when we played live.”

Harmony Central, "Chorus pedal for cocteau twins sound", OrangeLazarus, September 3, 2010

i have nothing to contribute to this thread other than the fact that I played with a guitarist yesterday that used Robin Guthrie's Big Muff.

Ryan Adams shared a photo on his official Instagram account featuring the Electro-Harmonix Big Muff Pi as part of his new pedal board setup.

In this scan of an article from the January 2006 issue of Bass Player magazine, the "Signal Chain" section lists the Big Muff Pi among Adam's gear.

An NYC reissue is featured in this November 23, 2017 Premier Guitar interview.

As shown on his pedalboard

Larry used a Big Muff in the studio during Pork Soda on My Name is Mud, Nature Boy, and The Pressman (mentioned at 24:15 on his 2017 Rig Rundown).