I used large smooth stone gravel on the left quarter of my tank and gradually faded it into black sand. I then took blue sand and swirled it in in the middle until it turned straight blue on the right side of the tank. Really created a nice beachy(is that a word?lol) effect. My corys hang out way over on the deeper sand and the gravel side I can now lower my filter intake down deeper and not pull up any sand. Anyway u choose just have fun with it.
Lol that sounds funky. What i might do is buy loads of different colours and put them in small containers to see whether i like different combinations.