I guess that is one of the reasons I collect sketchbooks from my favorite artists. I get a kick out of seeing the rough layouts and the problem solving that my peers and idols use to figure things out on the blank page. I personally feel it gives the work a gritty, earthy vibe-something about the building up of the lines and the narrowing down of the choices.
Or maybe I just like the color blue.

I inked over the bluelines here on this Nia Black piece. If you want to see the finished work just head on over to my deviantART page and check the gallery: