This is probably my most popular font: it has been downloaded about 45'000 times from dafont.com only! People seem to like punch out sheets...
I think it's pretty self-explaining. Cut along the solid lines, fold along the dotted lines and put some glue on the shaded parts, put it all together, and there you go with your new toys!
Here's what it looks like when brought to life with scissors and glue:
(And yes, I know I should have cleaned my macbook before taking this picture...)
You can download the font for free from here (registration required) or here! This is free for personal use only. If you want to use it commercially, let me know!