I will score out of 100 points, so look here for breakdown.
40 points: Originality. There are so many designs that have been made many times. I want to see something new. This is the majority of the points.
20 points: Complexity. Some great designs are simple, but the best ones are very detailed.
10 points: Name of design. Many times, the name does not suit the work. These should be easy points.
30 points: Usefullness. Is the design good on clothes? Walkway? Or is it not good for anything at all? The best designs are good for many things.
There are fabulous prizes as well. Post here with your code if you have a design ready.