Suggestions to what multiplayer games I should make?

Wazah! I just finished coding the basic module of a flashcom server with php. I would really like to make something multiplayer in Flash that would utilize this virtual socket server.

So far, i got
[list]
[]classic 2 player board game?
[
]rpg in an arena?
[*]Something new?
[/list]

Any suggestions would be greatly appreciated :}