I'm going to recommend reading Harmy's projects thread:
See if you can figure out it's proper name and as you read the thread you'll come across areas where Harmy is looking for help.
If you are looking to practice your pshop sfx skillz then probably the Fan Edit forum would be a place where you could get more requests for work. There tend to be lots of ideas but they come from people without the technical abilities.
and don't be surprised if this thread gets moved to a different forum.