Hey, first post for me!
Anyway a couple of nights ago I made a messy IR LED pen using one of those blow-pens (These:
http://tinyurl.com/5pf3hn) and it was very messy though worked pretty well. I had an embedded AA battery, IR LED from Radioshack, and a power switch from an old computer case. This fit together nicely and everything, but it didn't fill my need to be light, small, and durable. So then I went into my closet and found some Crayola washable markers (or magic markers). It was a challenge, but in the end I fit a AAA battery inside with one of those clicky switches you would find in cheap RC controllers. It turned out very nice, I hope you think it did too!
Sorry the picture isn't of high quality, I had to use my webcam.
