Call me BJT biased (pun intended), but I am a fan of the circuit design contests. It's a pretty cool way to see what people come up with and you might learn something too along the way (gasp). Raffles, giveaways, and "Guess the Number" aren't really contests IMO, but rather a fun way to engage this community. Also memes.
I think another cool idea would be an enclosure design contest to see who's got the best graphic design chops. Haven't seen that one yet here.
I'm almost afraid to see who can post the best meme.
This time of year might not be the best since it's vacation and house project season for a lot of you folks, so that's a factor to consider. I could be pleasantly surprised. Design contests also take longer to run. People need to find the time to breadboard, simulate, make a stripboard or PCB, test it, tweak it, write up a schematic, and post it. A month to 6 weeks at a minimum.
That being said, I wouldn't mind kicking something off now, but I don't have a sweet prize (or prizes) in mind or in my inventory. My building process has nearly stopped recently (just check my last build report), so I'll need someone to help judge and/or kick up a cool prize as an incentive.
Any thoughts?