Have a look at this easy way to make such a pillow from felt fabric or polar fleece (the cloth must threadless). You need felt fabric (polar fleece) in two different colors, scissors, and wadding (cotton) to stuff the pillow with, when it is ready.
Put the fabrics one over the other. Cut a big heart. After that draw a smaller heart inside the bigger one. Be sure to leave at least 2 – 3 cm between the two borders. This is very important, because when you cut the stripes (as shown at the image) they must be long enough so that you can tie them.
Start to tie every two stripes, which one over another.
Tie all the stripes in this way.
Do not forget to stuff the heart with wadding or cotton before you close the heart.
At the end, you can reduce the length of the stripes to make your heart bushy.