The Digital Photography School Forum has a number of very interesting assignments which makes for amazing photographs. One of its best assignments was Repetition and Patterns. Though very simple, it’s the simple things in life can make beautiful photographs.
For this assignment you needed to use patterns in whatever way you choose so that it would look interesting to a viewer. Shadows and light also make for great shots on this topic. Be creative and you would be surprised at how simple and beautiful your photographs can be.