Here's a desktop valentine -- a sort of Chia heart, if you will -- that will really grow on your loved one.
Trace around a heart-shaped cookie cutter onto a new sponge, then cut out the shape. Rinse the sponge well to remove any pretreated disenfectant, then let dry.
Dampen the sponge slightly, then put it inside the cutter.
Sprinkle grass seed onto the sponge, spritz with a plant mister, then cover with plastic wrap. Place the heart on a saucer so dampness won't seep through.
Make a card with care directions using paper and a colored marker to attach to the plant. Remove plastic wrap when shoots appear. Spritz with water daily and mow as necessary.