Some more examples of Patterning patterns.
The Black Square
This simple black square with some coloured lines illustrates a couple of important points.
Firstly this pattern can exhibit a wide variety of variations based on the several randomized parameters it contains. For this reason it's illustrated with two examples here.
Chita
Brazilian floral kitsch "Chita" patterns are common for textiles, table coverings etc. Here's a demonstration of how to approximate the style in Patterning.
The City We Invent
This complex tiling pattern can generate a number of stylized "cities". Useful for engraved patterns.