One of my favorites: Layers of old paint on old wood in intensive colors. Preferably blue. I´m sure you designers can do something with these textures… As usual, these are free royalty-free stock photos, which means, use them freely in your designs or on your web sites, but please don´t resell or otherwise re-distribute the images themselves.
Difficult to say how many times this wood has been painted, but evidently, there was always another color in the bucket:
More cracked paint in funny colors:
Here somebody applied some greyish blue on green paint, and they evidently did not like each other (good for the texture hunter):
Interesting pattern in the following image as well:
Btw., download hi-res files by clicking on the pictures (I´m too lazy to place a separate DOWNLOAD link underneath each photo):