I really like it. I think it would be cool to make a tall one and leave holes in the sides (kind of like a strawberry jar planter). You could easily do that.
Here is a link to the glue I used. I'm sure there are better glues, but this one is very thick and held quickly. I tried some epoxy glue I bought, but it was messy and slow to hold. I'm not sure how you would use the epoxy with a project like this. You only have so much time after you mix the two ingredients and then it doesn't hold instantly. I was having a very difficult time with it. It could be that it was the kind of epoxy I was using. I really think this would be fun if you had some great glue.
The glue I used dries to a color that almost matches the light river rocks I used. It scrapes off the rocks easily too so it's easy to clean up. It's supposed to be water proof so that is a plus. I saw some tubes of stuff they use for concrete and brick that might work as well. You have to use a caulking gun with them though.
http://reviews.lowes.com/0534/...
