More ideas

Some more:

  • Create a game using jME. Doesn't have to be advanced or graphically intense, something like pacman in 3D for example

And android related:

  • Create "virtual" arrow keys and other buttons on the screen, for those phones without keyboard but only touchscreen.

  • Multitouch support (Android 2.1 only?)

  • Trackball support

  • Optimizations to the core that benefit android