Here’s a cool design for an LED pen using an old mouse enclosure –
I meet Lori Stotko and Stuart Nafey http://lightdoodles.com/ at this years Makers Faire Auditions.
They had these cool Light pens they had made to doodle with.
I decided to make some when I got home, and remembered the old Sun three buttoned mouse I had saved in my parts bin .
Check out the step-by-step instructable – Sun three button RGB Light Doodler mouse.
Hacked LED Mouse Light