These Valentine's Day cards look great. Very professional. They are really easy to make, too. These are linocut prints. The image is carved out of a linoleum tile which is a relatively soft material. Much easier to carve than wood. I'm pretty sure that the polka dots on the first card were done using chin collé (gluing paper (usually rice paper) on top of your print using the pressure of the press).
example of what a linocut can look like: