Lovely for an engagement or a wedding or just to give to someone you love.

buttons
good quality thickish card
needle and thread
scissors

Faintly draw a heart shape on the card with a lead pencil. Fasten buttons around the outline with a needle and thread. I like to sew on two points of the heart first and then work my way around each side. Of course, this leads to a web of threads on the reverse side of the card but you can always cover these with a piece of card or fabric at the end.