When it came down to decorations for my fish, I didn't bother buying a whole lot, except for a ton of gravel and a plant. and a neat looking skull... and a diamond... a fake one of course.
I finally found an excuse to use the rock/shell collection I've had since I was a kid.
I SCRUBBED everything I put in there just to be safe (who knows what was on them) and made sure they were spotless before I let them anywhere near my tanks.
The result is a really neat place for my Nina to hide (crappy pic but you get my point) ((Also that small space w/ the divider is from when I first got her.. She has a ton more room now!))
a plate rock for winston to flare at, as well as a red shell for him to hide
and a ton of rocks and shells for my Tifa to do whatever with. I don't have a great pic of his tank yet, and I have some remodeling to do (I found a hole in his dorsal fin tonight because of those stupid plastic plants, so I took them out about 10 minutes ago.
just some ideas!