Devine Gas by Chiho Aoshima
I liked the art so made a wallpaper out of it, the orginal art is much much bigger.
click on download for higher resolution (1680x1050)
If i had some sparechange i would buy it. [link]
It's only 750 dollars, thats around 500 euro!!
but its pretty small size: 950 x 590 mm, rather have one thats wallsized.