There's an amazing number of options--all can look spectacular.
Frosted white or blue are particularly cool if there's some backlighting, various shades of window-tinting can provide a less stark alternative to the usual solid black. Dark pine green can provide the deep contrast needed to hide equipment and pop the tank colors without the harshness of flat black (had this on my shrimp tank-loved it so much I'll be replacing the overly stark black on my 37g with dark green next time I'm able to access the back).
I've seen some ombre treatments--shading from deep blue to light blue as you move towards the top--that are simple breathtaking.
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