Ok, after a couple minutes, here's what i did yesterday, as a sketch for my still in-progress conbadge.

I wanted to post-it cause i like it, and i'm just done inking and...it's no longer the same.

Seriously, inking lines and making pretty clean stuff is so unnatural...
I just like to go at it and woo, that's it.

I ponder using this one as a conbadge instead of the finished version, really, only thing that bothers me is that since it's soft and grey, people won't notice it.