Slitherine

Does anyone have an idea about how to make these? I was thinking about glueing a pile of small gravel together and painting the rocks white for the stucco.

I need to build some walls and thinking of the same problem. I think the way to do it is take a thin strip of balsa or a Starbucks coffee stirrer (for 10mm anyway) and use glue on one side to stick the 'rocks to. let it dry - then repeat on the other side. This will then create enough support on both sides to put 'rocks' along the top. Once done - base and hey presto, a nice rustic wall.