Heart-shaped page marker origami
Here's a quick little origami project that's fun to do with patterned paper: heart-shaped bookmarks that slip onto page corners. You could mail somebody a couple for Valentine's Day. Each heart requires a half sheet of square origami paper. With the patterned side to the outside, fold the rectangle in half lengthwise. Then fold it in half width-wise to mark the center line, and open again. Fold one side up at a 45 degree angle, so the edge aligns with the center. Repeat with the other side. Turn the paper over. Fold in the corners to form a heart shape.