You need a shiny metallic shade of nail polish which would serve as the base coat. Take white acrylic paint and by using a thin brush paint a dot on the nail. From this dot, paint 8 lines or spikes, extending from the dot in a circular fashion. Where the spikes end, draw two more spikes, something like one spike branching into another. So you will have a snow flake. You can also paint half snowflakes on the edges of the nails, and to give it a more attractive look, you could also paint one of the snowflakes in blue. In case you do not have metallic nail polish, you could even use blue acrylic paint for the basal coat. However, you will have to use white paint for the snowflakes.