Geometric decor is very popular now, and you can add trendy geo touches to your home for cheap and easily. The supplies are self adhesive black vinyl, a cutting mat, a craft knife, a metal ruler, cardboard. First make a template by measuring an equilateral triangle onto cardboard then cut it out. Roll out the black vinyl and using the cardboard template start marking and cutting out your vinyl triangles. Remove the sticky backing and lightly stick the decals onto your wall- ta dahhh! Be careful when you remove the decals from your walls – when you want to change them just slowly peel them off.