I found this awesome and super easy origami heart bookmark on How About Orange's blog. They have the most awesome DIYs - origami and non related origami posts. For more info on how to make this super easy heart >>>> click here
If reading a real book and using a bookmark is not your thing, you could also use the heart to make cupcake toppers:
Or stick them together and make this funky garland:
Fun fact: Origami (折り紙, from ori meaning "folding", and kami meaning "paper" is the traditional Japanese art of paper folding. The biggest risk of taking up origami is getting a paper cut, and as we all know those are the worst.