The suggestions of Peoplemuver are good advice for getting your kit extended.
A sampling device like the Octatrack could also be a host of many sounds and FX. You could also consider a MPC for sound mangling or the gear from Korg like the Electribes or the Volcas. But let me be honest. You will only have real fun with the gear you already have and also with new gear you add, if you dig into sound design yourself.
Getting well done patches for a synth and tweak it, is a good starting point to learn and see, what a synth is capable of. But let me tell you from my experience that it’s faster to start from a naked basic template and built sounds from there. I can only encourage to try out to recreate simple sounds yourself, following a good tutorial, understand what is going on that makes out the character of this specific sound, and then continue with more complex sounds. There are some basics, that are learned easily and fast, which built upon each other, and after a relatively short time you will listen to sounds and get an idea, what could be done to recreate this sound. It’s about knowing your gear, understanding synthesis at a moderate level, listening carefully, and much experience, which will develop over time.
If you are interested to start this learning, I would recommend to have a look on a very good series of articles on sound-on-sound.
http://www.soundonsound.com/sos/allsynthsecrets.htm
Don’t be impressed by the quantity. You can pick what you are interested in. Most articles are self-contained.
The book “Becoming a Synthesizer Wizard”, by Simon Cann, is a good resource to learn about basic sound design using “subtractive synthesis”. Well, I wasn’t a wizard after reading it, but I got some ideas, how to continue.
If you learn to ride your AF, you will never regret. As I said before, it’s one of the most versatile synths on the market and there is a world of sounds inside, which wait to be explored. You have only to open this door by yourself … and maybe … we here in the forum can be of some help.