I read a tip recently about using pine bark as rocks for basing. I wanted to whip up a couple sets of trees and I thought that some pine bark rocks might help dress of the clumps and make them look more natural.

Here's my WIP and finished bases with the trees attached.

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The pine bark is almost great on it's own, but with a little brown and grey paint, it looks very realistic. The way the bark is layered mimic natural rock formations very well and I plan on adding lots more to my bases and other wilderness terrain.