I make art a shit ton, it's like, you know how people procrastinate on doing art, well I procrastinate on my field of expertise (game design) by doing art.
What a wonderfully productive cycle. Anyway, here's a couple things I did the do on. I draw virtually everything from scratch, and rely on external resources whenever possible. But there is a chance I've gone and nabbed a background from somewhere, typically though- since I have an art team, I'll make use of their work.
I ended up calling this one Deprived Lunacy.