MPD and the Purple (Green) Crayon

Quiet.  Too quiet.  Know what I mean?  So I went looking for him, and here he was, hard at work up on the laundry room counter...

"MPD, whatcha doin'?"

"Driving my car.  Drive drive drive."  said he, showing me all the roads he'd been "driving" all over the whiteboard.

Okay then.