For a great show up on how to use HAM besides a picture viewer you can check the game Kang Fu. Not sure if it's HAM8 or HAM6 (probably ham6)...
Some game features:
- 68020-060 compatibility
- enhanced graphics and sound using optional fastram
- hires gfx (non-interlaced) with approx. 1000 colours on-screen
- dual playfield with HAM (digitised HAM backgrounds in second playfield and digitised objects in foreground)
- 50 FPS update, fullframe scroll and objects
- 22 CDDA soundtracks
- joypad/joystick auto-detection
Too bad the game is not that fun to play, but the clever coding is great.