Here are some pictures of my Positive Life Journal to give you some inspiration:
I glued a bunch of hearts that I cut out of a flyer the other side of the notebook cover to remind myself to love myself just the way I am.
One idea for your journal is to make happy pages. Basically, just make a collage of a bunch of things that make you happy. You can even make each collage themed! When you're sad, just look at your happy pages and you'll be smiling in no time! I like hiking, biking, camping, and Geocaching so I decided to make an outdoors themed collage with magazine and flyer pictures.