Hi!
I've got spare blocks, and I'm already running into donation caps every game day so I figure I'll do something useful with them and distribute the wealth. Auctioning is boring, so here's a more exciting proposition:
1 - Take a look at my stock here: http://imgur.com/mAmso (these are mostly stacks, not single blocks)
2 - If you see a block you need, send me an in-game mail requesting which you need with something attached. Doesn't need to be expensive, but I would appreciate it if it were creative (rather than 1 grain or whatever).
3 - As long as I've still got the block in stock, I'll send it to you as soon as I get the mail. If I don't have it in stock any more, I'll send your item back to you.
Let's get block trading! Block badges for everyone! :)