Forget blurred lines: at Spring 2014 New York Fashion Week, it's been all about straight lines. In lieu of intricate nail art, designers have been sending models down the runway wearing simple, clean straight lines on the nails. Whether it's horizontal, vertical, or both (like the look from Tibi, pictured above), this look is easy to achieve at home. Just grab a nail art pen and draw. If you prefer a more precise line, however, painter's tape is perfect to use as a guide to form straight shapes. You can also try striping tape ($3), a thin adhesive strip that's easily cut to size.