Making a rock cave?

[FroFro]

I'm going to be replacing the hollow pillar ornament in my tank for a nice piece of drift wood I filched from my tropical LFS. They wanted to throw it out for a "cooler" looking piece of mopani to put in their main display tank. (insert eye roll here).

I've got two khuli loaches and we all know how these guys love to hide when its daytime/not feeding. I started keeping my one remaining tank decoration, a roman pillar thing in the shape of an L, at a tilt as the inside is hollow and my khuli's don't like to use my terracotta pot caves. I want to tank out the decoration and place the driftwood inside and smother it in some more anubias. I've peeked at some caves online but I'd prefer not to use some of those tacky artificial caves they sell. I'm thinking I can find some flatish stones and sort of prop them into a cave like shape and use some aquarium safe adhesive to keep them together. I can then of course attach a plant or some java moss in the future and keep it looking natural. Is this possible or do any of you have some ideas for making caves? I'm a bit crafty so I don't mind making it myself. Any help brainstorming would be wonderful.

 

[WillowDryad]

Glass jars with aquarium rocks as coverage. Works for me haha