Here is how you can make a checked heart using paper.
Glimpse of the Result:
Take a sheet of paper colored on one side. Start with the colored side facing up.
Make creases along the diagonals. Place it in the shape of a rhombus.
Bring the top point downwards close to the center crease.
Turn upside down. Make mountain folds.
Bring the top downwards and make another fold. I forgot to take a picture at this point 🙁
Lift the right side upwards along the center crease.
Repeat the above step for left side.
Flip. Fold the top edges as shown.
Fold the triangles at the top in half. Flip and the checked heart is done.