Field of Glory requires that each army place its camp on the table. That's one of the many things I like about the rules. Many accounts of classical period battles mention the camps and how a threat to a camp could change a battle's outcome.
My Macedonian camp is pretty simple. It's an unfortified camp, so I just used a Greek tent and various foodstuffs, all from Baueda, to make it look like a supply stockpile. This is the first time I have ever used Baueda, and it's nice stuff. These models cost me about $8. I guess I could have tried to scratchbuild something, but I could never have made such beautiful amphorae.