One thing I'm wondering, and I might be TOTALLY off-base here (tell me if you think so). Would it look more engaging if the rotated-square background were also "rounded" like the oval that is behind the "insider house" text? That is, the oval has a gradient that makes it look more "3D" whereas the rotated-square, while there's a gradient, is clearly 2D.
Or would that look too busy?
Like I said, I'm no designer - just throwing it out there ;)