GameCraft Miniatures have released a set of 15mm cobblestone bases.
From their announcement:
Tired of seeing your figures marching down the street with grass and rocks under their feet? These new cobblestone bases are just what you need.
Each kit contains:
- One large base 2.5" x 2" (64x50mm)
- Two medium bases 1.25" x 2" (50x32mm)
- Two small bases 1" x 1.25" (32x25mm)
Bases are compatible with most 15mm figures and vehicles and work with most 15mm gaming systems including the popular "Flames of War"™ game system.