I've been uploading a number of rolodex drawings and so far I'm enjoying what I'm putting down in these little 3.5"x2" cards more than what I have in my sketchbook.

The small format forces you to focus on a specific aspect of your imagination and when you draw it out, it turns out to be much more concentrated. Also there's a level of mystery since the viewer is left to fill out the rest of the scene with imagination.

Besides, who uses Rolodexes anymore?