This is a good idea. I started testing this previously by just choosing different wallpapers, but didn't take a step further to photoshop in some text.
I may yet in addition to the space naming. It feels like it would be helpful to see on the wallpaper using expose, and also from the three finger swipe up.
Really, Apple should allow this meta to be overlayed on a wallpaper instead of having to photoshop it in. I'm perplexed on why Spaces has gotten zero improvements for so long.