I got a card last year from DD1 (kindy) that she had had to draw a picture of her choice on, and then the teacher wrote what she said were her favourite things to do with me. I loved it. She also decorated a little terracotta plant pot and they planted seedlings in them. This year on Valentine's Day (could be adapted to MD) I got a keychain thing from DD2 that was different coloured beads that she had threaded, with the key ring bit on one end and a love heart on the other end.

For Father's Day they did painted handprints on a tile, and a card along similar lines of the Mother's Day one.

Only kindy level, but I think older kids could just do a more detailed job IYKWIM.