[Locke]

- Write a video game emulator (any old console or computer platform)

- Create a programming language

- Restore an old broken down pinball machine

- Build a mame arcade cabinet

- Write some Interactive Fiction

- Learn to make awesome programmatic artwork with something like Processing or Nodebox

- Create a roguelike

[aaronblohowiak]

- Create an editor.

- Create an os in the language you designed above.

[Raisin]

It's like your read from my personal list.