Work Wheels Japan has their own line of lug nuts suitable for all aftermarket wheels with a 60 degree conical seat. They are high quality with buttery smooth threads matched with awesome machining and colors.
 
These are the RS Type closed version, meant for cars with stock wheel studs and owners wanting a more low profile look in their wheel hub area. They are made of lightweight T6-7075 aluminum and available in M12x1.25 or M12x1.5, and in blue or red anodizing.
 
NOTE: Do NOT use an impact wrench on these.