OK, I love this idea DIY - Coasters from wine corks and old picture frames. This is a set of 4 coasters, 4 x 3 including the black, ceramic frame and thick. The cork area is x and the corks are about 1 cm higher than the frame.
Take 4 canvases of each size), paint them a solid base color and add vinyl or stenciled design. stick decals onto canvases, paint the whole thing and then remove the stickers to reveal the wonderful artwork!