I'm not to keen on those common backgrounds with rocks and plants on them so I went a different route. I'm big into scrapbooking so I took several sheets of 12x12 scrapbook paper (dark brown patter), taped it to some poster board, and then taped the whole thing to the back of my tank. I absolutely love how it looks. Just another idea on another option.
75G- (3) Firemouth Cichlids, (10) Tiger Barbs, (3) Dojo Loaches, (3) Yoyo Loaches, and (1) Sailfin Pleco.
46G- (3) Pearl Gouramis, (5) Black Skirt Tetras, (7) Harlequin Rasboras, (3) Dojo Loaches, (1) Clown Pleco