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Apparently there are fewer books with geometric designs on the cover than I naively thought there would be. (Of course, "geometric" can be interpreted in almost any way, so depending on your interpretation there are a lot.) I'll post any that jump out to me after scouring my shelves, but until then, here are a few that look to me like they qualify:
Eames: Beautiful Details
Patterns of the Universe: A Coloring Adventure in Math and Beauty (Maybe not a lot to actually read here, but it's fun!)
Methods of Thermodynamics
Iron, Potassium, Nickel

I'm midway through a re-read of this: How to Take Smart Notes: One Simple Technique to Boost Writing, Learning and Thinking � for Students, Academics and Nonfiction Book Writers, which I think counts.