Oh, it's simple.
Sign up on a topic saying you'll do it. Then one of the cast or mods rngs the participants up with each other, and when your secret gift is complete, you PM it to them and ask permission to post it on the boards.
If the cast has a collectively higher IQ than me, they might be able to fashion a device better than this, but this seems simple and easy enough.
plz dunt kil me ttv i was only jking