I am liking the black, before I used a natural scene with white, cream, brown... like outdoor pepples in gravel form. I have some purple scattered in it the black too. I went with a solid dark blue reflective background, it appears to bring out the fish color more.
Went with fake plants this time because I settled on a 3rd species of fish that will eat the live plants. Got a pair of Red Belly Pacus to complete the South American theme. Was going to add an Oscar, but I don't have the room with Big Daddy Jack in there. The Pacus will get huge too, though now they're only 3 inches. I hear they grow like weeds, so we'll see. I might have to trade them in if they just keep on growing.
You have to be careful with dead wood and rock.. each substance adds stuff to the water. Can be really healthy for the fish, or it could be bad for them. I have purple quartz for the nutrients it releases, and black slate. Good for cave making too since I have the territorial Cichlids.
I have to build a custom hood now... my tank size is not a US standard so the lights will be 2 inches too long, a 48" instead of the 46" I have.
Was planning on getting a double tube light "stick" (not a full hood, just a strip) and hinging on the current doors I have for front and back. Then using an inch thick wood to frame the light around the top of the tank. Painting the wood in black and sealing it to keep it from sweating or swelling due to the moisture of the tank.
Has to wait until payday though, I've maxed my fish budget already by buying the big guys.

But they're so cool.