My idea for my nails was to have several different designs, but have the recurring theme of blue and white (I ended up doing lots of blue+silver though).
I ended up with three nail designs I really liked, a silver to blue gradiation, a blue and silver stripe, and a cool color that I made layering two existing colors I had.
My fave nail would be the silver to blue gradiation. For this nail I first painted it with a silver base (Sally Hansen hard as nails Celeb City). I then painted one coat of China Glaze Dorothy Who? Then I painted the tips of my nails with another layer of Dorothy Who? This color is great for building up a gradiation since it's sheer but builds up color intensity with every coat. I then added some silver glitter with a fine brush just at the tips of my nail bed.