New puzzle game concept art

While waiting for art for Diggity, I've been thinking about a puzzle game.  I was playing some Snoodoku, and trying to figure out what made that fun, and came up with a new idea.  It's going to be a logic puzzle game, played on a computer, details still a bit fuzzy, but I've been working on some icons (see below).  Also learning Illustrator, which is a bit tricky for me.