Razorboy's new how to build a wall

Get some premixed drywall paste. I had a half a pail leftover from a drywall project and being the proverbial tightwad I decided to put it to use.

After picking a "form" (cat litter container lid) I mixed my desired base colour right in with the paste and smoothed the mix out as evenly as possible, filling the form with the desired thicknes of "stone" material.

Mix together thouroughly and allow to dry for at least 12 hours. After that it should look like this -

Break the "Stones" into pieces in the size you require.

I used a piece of styrene strip as a base for my wall although I am certain other material might work equally well. I used crazy glue but your brand should work just as well, so use what you like.

Once complete, I glued the rock wall 'sub-assembly' to the base.
 

I used the extra rock quite liberally on the base, establishing an association between the wall stone and the gound stone.