I like ATCs because they're small, I can do something fairly neat and decent in a reasonable amount of time, and they can fit in a pocket so if I like want to hang out I can grab easy instead of dragging a huge art bag. but I just only do every so often cuz I'm LAZY and digital is so much lazier lol.

 Blutfuss did the top left, I did the rest. and I'm gonna redo most of these on thicker paper.