Hurrah! I only really remember the Art contest, and I can't even remember if the monthly themes were voted on or decided beforehand... I only participated in a few, but I don't think there were a great many anyway. Dartfan would remember more if he were around (I miss you DF!); plus he made nifty 'prizes' for the winners (I still have mine! Nifty!
)
However, if the theme contest were also to be resurrected, I don't know how I feel about there being 'winners'... though that is what made it a contest, I suppose. I think it deterred some people from entering. If clever crafty mods could think up neato themes, I think it might be most fun just to see everyone's entries, or if winners are necessary, have a 'winners' circle' of...oh...how 'bout eight, since it's such an important elfin number? (provided eight people entered...)
Now art-trades, or the couple we did, were super-fun, but I can't think of a way to get around the "no one did mine!" curse. We had a sign up sheet and everything, but it was still a cross-your-fingers kind of job. But boy was it fun when it worked!
Now I am absolutely poo at all things organizational, or I'd throw my hat in the ring here to help you out Foxeye. I can be wicked moral support tho!