Well you can't say Valve only cares about Team Fortress 2. Train (or de_train), a classic map from Counter-Strike 1.6 times, just got a facelift and a redesigned layout for Counter-Strike: Global Offensive.
It's a pretty big map to play CS:GO on, but definitely a fun one. The level takes the maze, the pool, the training area, and all the colorful locations from Lara Croft's various manors from the Tomb Raider games, and mixes together in the form of a Counter-Strike map.
The Asiimov skin for the AWP sniper rifle in Counter-Strike: Global Offensive can be a pricey one, $30 or a lot more if you're not lucky. So buying one might not be the best idea. But modifying a generic paintball marker to match the one in CS:GO? That's much better.