More map suggestions:
Royal: CTF map with a poker team, two large fortresses made out of cards with poker chips, dice and more cards strewn around between.
Cave: Escort map inside a mine - Yup, somebody actually managed to make a minecart escort map before Valve released Goldrush.
Station: Rather standard straight CP map (5 CPs), but it's pretty fun.
Wacky Races: A racing map where the objective is to drive around the course before the other team can do so. You can slow down the enemy's truck by shooting the front, and speed up yours by shooting the steering wheel in the front. The spawns are inside the trucks, so everybody always respawns around where the action takes place (They can't be stickied, if you're wondering, the whole truck is "bouncy" so sticky bombs will bounce off). The trucks will also stop at two places while you have to do something - First you need to lower a bridge, then you need to bust open a wall. Once a lap has been finished, enemy intel appears in front of the finish line, you only need to take it over the line to cap it. 3 laps to win, of course. The only bad thing is that the map isn't very special graphics-wise, but that hardly matters.