Nail art devotees know that the designs you create can be attributed to the tools you use. Typically you'll find an array of striping brushes, dotter tools, and sponges in a manicurist's kit. But we've never seen dental floss! Instagram star Sandi Crystal Ball [1] uses Dentek Floss [2] ($20) to get this striped nail design. It doesn't require any fine motor skills to get this look. Just stamp and layer the colors to re-create this easy effect. Sandi's simple take on DIY [3] manicures has us watching her YouTube channel [4] again and again for tips. We especially love her rainbow ombré how-to [5] (hint: all you need is a makeup sponge).