These can of course just be plain markers, but that wouldn't be very pretty. Dougie's Wargaming Blog and the Silver Whistle have both made attractive scenic items out of their JOPs. The weapons caches from S&S Models were a natural fit for the Taliban JOPs with AKs and RPGs on rugs hidden under tarps.
For the Canadian JOPs I used some left over stowage and a weapons cache that looked more "western". The piece with the map and radio handset put me in mind of a typical company or platoon command post. So I added a ruck and ground sheet to bulk it out.
For all if them I first glued fine sand onto a fender washer and let that dry before gluing on the pieces. I have found that doing the ground texture after makes such flat pieces look like they are sunk into the sand instead of sitting on top. After everything was primed it was a simple matter of painting and highlighting.