You could also keep the heart whole and it would be super cute.
First I "gold leafed" the pages. I just lay the book on the ground sandwiched between two pieces of foam board. I stood on top and sprayed it with gold spray paint. Do one edge at a time and make sure there are no gaps between your book and foam borad. Also, make sure your foam board is in good condition and has straight edges.
I applied one fairly light coat.
Now for the gold leaf!
Cut a heart in your gold leaf. I had lots of practice cutting hearts in elementary school so I just free-handed it. ;)
Next you are going to want to lay your heart on a disposable surface, I used a napkin. Apply a coat of spray adhesive, pick it up without touching the sticky side and lay it on your notebook cover.
To remove a piece of the heart I simply touched it with my fingers right after I lay the leaf on the book. It stuck and I just pulled a little off. You can choose to skip this step and let it sit for about 20 seconds and then lay a piece of paper over the heart and press it down.
And there you have it: a thoughtful gift (or something pretty for you) whether or not you leave the heart whole or take a little piece of it. I hope you will try it!