Cobalt
For your nails, try
Illamasqua Nail Varnish in Force ($14;
sephora.com). For lids we love
Estée Lauder's Vivid Shine Eyeshadow in Fire Sapphire ($24;
esteelauder.com). Start with a good spackling of undereye concealer so the shadow doesn’t bring out your circles. Then do a sweep of blue shadow just on the lids to the outer corners, and watch the bold blue make your eye color pop.