The DIY Projection Watch. Buy one cheap LCD watch. Fiddle about with lots of bits and pieces, LED lights, soldering irons and a magnifying glass. Presto, you’ve saved $5.00 on a retail product and gained acres of geek cred.
The first time I saw a projection clock (a friend had shown me his projection clock, which he used to project the time on his bedroom ceiling), I knew I could easily build my own by converting a watch with an LCD display.