hmmm.... i think u could just make a poly with the pen, and bevel or extrude a little. also if u want some randomness, before u use the bevel or extrude, use a little jitter on the poly. Then see if u can place them in that cobblestone way...
or
Make a texture with a bump map... that shouldn't be too hard.
1 crit. The fence and all the stuff isnt very visible on that side. It sort of takes out the detail in the scene...
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