Just something i thought of when bored...custom grips! This might be nothing special but just for looks and i think it works pretty well if u look at the lowest one which is Towel grip and warped over by a normal overgrip. This i think is useful because if your hands are dry, the normal grip makes it less slippery and when your hands are wet, the towel grip makes it less sliperry. And the other two are just normal grips wrap over so that it makes ur raquet grip thicker but not tooo thick...but yea, it also looks awsome if u have the right colors XP
If you like the 2 colour look, Karakal do a "Duo" grip which comes in 2 colours already and won't increase your grip size like using 2 mono colour grips will. And would be cheaper than using 2.
victor grip with pu and towel -> http://www.victor-international.com/produkt_fotos_2009/klein/2009_56.jpg
WOW AWSOME O_O hahaahha and i totally made me homemade version...i just bascailly cut normal ones's widths in half, and then...yea lol now i feel stupid T_T
if you really want to have duo band with non-towel grip, you can try interleaving two grip of different colors. i have tried that and it works out well too.