ATC - Artist Trading Cards. 2 inches by 3.5 inches.

http://www.atcsforall.com/

Wandered onto a web site for trading these tiny artwork. Here are 3 that I made with markers on "Elepoo" paper. That's right, recycled elephant poo made into colored papers.

I've got several other colors but haven't played with them yet.

Was doing some doodling last night. I just love trees.
These have leaves despite the naked branches outside.
The copy is a little odd since I was using a blue fountain pen on brown paper.
It's in a tiny book I carry with me all the time - about 3 x 5 inches.
I think everyone should carry a little sketchbook.
You never know when the urge to make something will strike!