Sprite: Removed border & refactored static code

@madskristensen, you were right; we don't need border. 

Nonetheless, it looks more *techno* with darkgreen borders (just a 1px gutter, it will be ignored in any case):

![aa](https://f.cloud.github.com/assets/3840695/1899460/d4b5b302-7c3b-11e3-9ea7-c68e255190f6.png)

(matrix-like) 8-)