I have recently discovered the wonderful world of Icon Challenges.
It's really bunches of fun and is, as it indicates, a challenge. LOL I did limit myself to 4 challenge communities because it gets confusing which community requires what for their challenge but I have to say... Wow. It's a lot of fun! Even if my icons aren't good enough to win anything, it's still fun to participate and try to come up with something interesting with the parameters that are given for the challenge.
You don't have to be entered to vote. So, go support these communities by voting for your favorite icons.
I'm not a member and/or not entered for some of these but they are the ones I've found that interest me so far.