When thinking what to present for the St.Valentine's Day, we rarely think about making the present themselves... However, such a present would be a very pleasant one, expressing your genuine feelings to your beloved!
So, one of the articles you can make is a knitted/crocheted heart.
First you should knit two sides of the heart and then you have 2 variants:
1) you can cut from foam-rubber a shape of heart and tie two sides of the knitted heart over it... or 2) at once tie two part of the knitted intermediates and then fill it with pieces of fabric or some other stuff...
Should look effectively!