I've had a background photo sheet on my tank for years, but since my large Oscar died and I went into smaller fishies I thought I'd try something different. I have had the wall my fish tank, is infront of, mirrored to about 120cm high, and bought artificial plant stems from $2 Shop and glued them to back of tank. It looks neat, cause I have pot plants around it. It is probably very expensive, (I have a friend in the glass trade), but you never have to paint or wallpaper there again, and is a real feature. If I knew how to post photos over here, I'd send one to show you what I mean.