planted sand freshwater

Hi everyone, I've got a planted 4 foot tank that I have been working on quiet a bit lately. Recently however I have been looking for a backing to put on my tank. I would like some advice as to what would look best. I've gone for a somewhat natural looking tank so black is sorta out of the...

A better pic of my 200 ltr ...all natural plants...and some sand....and some fish...lol