I saw a home show over the weekend where they used some k...

[fastlearner2]

<div>I saw a home show over the weekend where they used some kind of homemade rocks for pavers that were very lightweight. I don't know what it was. Anyone have any ideas what it might have been and where I can get information?</div>

[DesignedEye]

<div>I tried to look that up because I've seen something like that done. Couldn't find anything though. I'll keep searching. Did you find anything?</div>

[vampics09]

the excellent answer.