Yo dawg, we heard you like Arenas, so we put an Arena in your Arena! Behold, WoW's Circle of Blood Arena map, transformed into a Team Fortress 2 map. Sure, it might not have the subtlety of Dustbowl or Well, but as a reproduction, it looks terrific. They even got the starting areas working right. And look at that sky!
You can download this map for TF2 and a very similar one for Counter-Strike: Source over at the creator's blog. I doubt it'll jump to the top of any major playlists any time soon, but if your usual group of TF2 friends also have spent some time in the Arenas, they'll probably get a kick out of it.