Adjust brightness/contrast.
It'd easily become something like this.
![](http://i42.tinypic.com/28knbz6.png)
And if you add some effects, it becomes like this.
![](http://i44.tinypic.com/rtqnae.png)
Point of this post; it's way, way too plain.
Minimal contrast sparks minimal interest, and just cause it has lines going in a general direction doesn't mean it has flow.