This design is definitely a messy one, but it's also absolutely the most fun. Paint a white base coat and wait for it to dry completely. Then, get a straw and cut in half; put some red nail polish on a paint palette, tin foil, or jar lid; cover the tip of one straw end with the polish, aim towards the nail, and blow into the straw. You'll get a messy blood-splatter effect. Depending on where your polish splattered, you might want to clean up your cuticles a little. Whatever you do, just don't suck nail polish up the straw.