BRS sells big bottles of super glue for like $25, I recommend that for basic reinforcement. There is a quickset spray I recommend as well that they sell which helps set a big glob of glue quickly so you don't have to prop it up or hold it for a long time. If you want more elaborate just get a long mortar drill bit along with some fiberglass driveway markers from Lowe's/HD that are about the same size. Situate 2 rocks together how you want them, drill straight through, stick the rod in and cut to length. I used super glue on the rods to keep them from sliding. Then situate your next rock, drill, rod, repeat. Afterwards I rinsed in RODI to get the dust off.