Mackin Industries Stainless Steel Lug Nut Set 35mm 12X1.50mm. Very simple and subtle design. Comes in either 16 or 20 Lug Nuts. These are Taper nut (17 mm) and will fit most after market wheels. Lug Nuts are Made in the Taiwan.
Here's how they look on a 15" Desmond Regamaster:
Here's how they look on a 16" SSR Formula Mesh Wheel: