Bark is wonderfully organic and varied, it's also easy to
thus making it a great thing to make materials from :)
Fire up yer camera and take snaps. Now, I'm lucky, lots of great
trees near me. Snap away! Watch for sunlight being too bright and
forming bright patterns on the bark as you take pictures, avoid
that, usually. You want a nice overcast but bright day.
Now, ideally you should make these pictures for textures,
square in shape and SEAMLESSLY TILED, it's easy with Paint Shop
I made a script in Paint Shop Pro9, to make life MUCH easier! Script
-Selection (Square) near middle of picture, large as possible, and
cutting out any curvature of the tree trunk which distorts the texture.
-Crop to selection.
-Make Seamless tile.
That saves a ton of time!
Lots of other ways to do that with other applications. A great
seamless tiling plug in for Photoshop (and paint shop pro), is IMAGE