would make a nice gift wrap. i'm a fan of patterns for gift wraps. :-)
I dig this as well. I'm an Escher fan as well :P
Anyway, keep it up man, and don't let mean comments get to you.
personally, I think it would look a little more interesting if you put some subtle hues into those grays and used a bit of hue shifting. example:
dunno if it's because i've visited my dentis too often last year, but: I'M TIRED OF THAT BORING PERSPECTIVE / ESCHER STUFF. please leave it away from pixel-art. please!
*headache serves you right =)