Just a quick thought. Counterstrike fy maps are sometimes some of the funnest to play maps and a nice break to the typical large defuse maps.
It just questions me how undetailed they usually are. The maps being so small could easily have tons of detail and offer a nice contrast to the otherwise dull undetailed maps. Here's a nice example, though I haven't test played it yet.
http://www.gamebanana.com/cscz/maps/107977Imagine what depth of detail and intricasy you could add to fy_iceworld/ etc.
hegrenade arenas are the shit. And yeah, fy maps can be pretty fun.
I agree Rimrook, it is very inspiring.