This blend shows how to create nice patterns using shading nodes. Some parameters are created by function #noise.random() put into some of the node fields. The result are patterns created by chance and some rules. By changing some of the function and /or connections the pattern base character will change. To see the result, just create an animation using "viewport render animation" This quickly creates 250 images in c:\tmp. This blend is intended to be modified to get the patterns you like.