A few ideas...

[ianoid]

I have ideas for 2600 games:

 

Switchboard

 

Basically, take one game's boards, and add in the other game's action, and you have switch board. Perhaps additional ideas could be throw in there.

 

For example, you could try Indy 500 tag on a Combat board. Or take the Indy 500 cars, add firing capability, and add them to a Combat board. With some modifications, you could do Venture Combat (tanks instead of face/arrow guy) or Pyramid (circular?) Kaboom- which would be sort of Tempest-esque.

 

Eh, perhaps these idea aren't that great on paper. Or screen, as it were.

[Classic Pac]

Heres my idea and I think the 2600 can handle it. Try combining Combat tanks with a board game. Each squaire represents what happens to the other player bonus points, explodes, or etc.