Ok, so I've tried too. I haven't done pixel art in a while and I found out that I need to practice much, much more, but still, here you go with first three.
Hmm, I'll try to make a few I think.. Looks like fun
Also I think rewards requirements should be public for the smaller ones and then like big and secret ones should be kept secret.
I think I could try it, I have experience with eclipse and event systems on it. And I think I would be able to think of interesting storylines, but I fear I will not have the time, so I'm probably out.