Sparkly Jagged Rainbow Gradient! First layer your nails in black. Next, using glitter polish and a nail art brush (Or an eyeliner brush, concealer brush - any thin brush will do) make thin vertical lines going down your nail. Neatness does NOT count; you want uneven lines! Use at least 2 colors on each nail, creating a gradual gradient. *Amp up the oomph* Use multichrome polish instead of glitter polish! *Tone it down* Use a neutral base, and cream polish instead of glitter.