One the earliest versions of my Lake Malawi tank consisted of piling rocks on top one another to create the natural environment that the Mbunas enjoy in order to keep aggression and stress levels down. Just take a sweep across Youtube, and you'll see slews of videos where owners of African Cichlids pile rocks on top of rocks like its the only rule for owning these species. And quite honestly, I was never a big fan of that particular style, just having a giant pile of rocks in the middle of my tank seemed very simplistic and lacked any kind of cosmetic appeal to a hobby that is all about creating the touch and feel of a world that is just as beautiful as it is mysterious.
So after a few weeks of the status quo rock pile in my tank, I had had enough of it and headed down to Home Depot to see what more I could do other than using the river rocks found in the field next to my house. One of the things that frustrated me most was that there was no uniformity to the rocks I was using, thus any structure I tried to build either wasn't stable, or lacked any style. It was a situation where I would always tell myself that this is the best I can do, and settled for that.
So my trip to the Home Depot was an attempt to find some rock structures that allowed for a bit of uniformity and style, while also keeping in mind what was the best possible dwelling structure for my Cichlids. And thus, I noticed these simple yellow/tannish colored stepping stones in the outdoor section of HD. I was able to use these stepping stones as caps on top of my rocks to give the dwelling stability, as well as a nice look, almost as if it's a long lost underwater civilization that had been flooded over. The color themselves blended well with the environment, as even the slightest growth of algae gave the caves a more defined look and feel. My Pleco especial loved the flat surface to graze off, and my Cichlids never hesitated one bit from these dwellings. Bottom line: I think they look a whole lot better than a pile of rocks that looks as if a 5 year put together.
The rocks were very cheap, (granted not as cheap as the free river rocks I found) about 75 cents a piece, and because they are a relatively good size in diameter, I didnt have to buy a whole lot. Quiet honestly, my entire cave dwelling cost me under 10 dollars, not too bad.