I am posting an instructible on how to make an origami heart. This method is very commonly known. Difficulty level:Easy
Step 1: Make Triangles
cut 2 triangles out of the paper you have.
Step 2: 1st Fold
Alright, this will be your first fold. Fold one of the triangles in half.
Step 3: Fold 2
Unfold the folded in half triangle. Then fold the top of the triangle down about two thirds of the paper.
Step 4: Folds 3 and 4
Here you will be making folds 3 and 4. Fold both of the side corners of the paper up to the top, creating the picture below
Step 5: Folds 5 and 6
Now you will make folds 5 and 6. First, turn the paper around. Now just fold the top flaps into smaller triangles. You have now formed your basic heart shape.
Step 6: Last Folds
Finally, you will make the last folds. On the same side that you were on for step 5, fold the pointy corners in. Now you are done!
Step 7: Done!
Congradulations, you have made an origami heart! You can fit a love note into the slot in the front and give the heart to a valentine.