maybe someone kind out there could borrow some of my ideas... like:

Mario party map: a mario themed map with Mario as the biped and some luigi, peach, toad, or any other mario character based ai's. the vehicles could be skinned with mario-based color schemes, and weapons could just be reskinned, plus you could add a shell launcher, or a shell grenade, or a fire flower...

Halo 3 valhalla: a valhalla looking map with a custom hornet, a spartan lazer, and some other items. i probably don't have to go into TO much detail...

lego map: a reskinning of bloodgulch to make it look... lego-ish... maybe a lego grenade, or lego bipeds.

a leaf village type map. some buildings from Naruto, a katana and surriken, or some jutsu. for the vehicles, you could use summons, like the giant toad or something...

Valhalla is being done by H3MT as far as I know.

Check for a Lego map in this site's directory or halo2file.com.

The Nintendo Map Team is making Nintendo stuff for haloCE.

The Naruto idea has been brought to the table.