Dude don't listen to the guys who are just talking about the white borders...who cares!! This image is pure dopeness and nothing else. It's so intense and beautiful and the colours are so smooth. Love it!
NightzfxFeatured By OwnerApr 9, 2010 Interface Designer
"Depending on the work, you may want to have it matted to the edges of the paper, or have the image "floated." Floating a work of art means exposing the whole sheet with its edges. This technique is not as secure, but is often chosen for aesthetic reasons, particularly if the paper has rough or unique edges that are part of the work of art itself.
Either way you decide to mat your piece, the bottom margin is generally slightly wider than the top to give the entire image a visual weight. The sides should equal the dimensions of the top margin. Standard margin sizes are 3" to 4" inches on the bottom and 3" at the top and sides; these dimensions, however, will increase or decrease proportionally according to the size of the work of art."
Basically some digital art i've seen has imitated the look of it being 'mounted/framed/floated/whatever' just by having the piece sit on a flat white/black layer using those guideleines above. Thought that mighta been something you were fiddling with.