If you've gotten FL Studio 12, you might have seen this software. This is what I use for a lot of my synths. And they are great to manipulate with effect VSTs to make them sound more unique and/or wierd
Additive synthesis at its finest, I think Morphine is a magical tool for mainly ambient-style pieces and lots of fun to experiment with as well. From soft pads to hard-hitting basses through bells, anything really.