This is a card I created using masking. I began by stamping the blue flower that appears to be on the top of the other two flowers. Then, I stamped the same image on regular copy paper and cut it out. I laid that cut-out image on top of the one I already stamped on the card. Using pink, I stamped again overlapping the cut-out image. I did the same thing again in purple. Looks like it could be difficult, but it's easy.