There is no set way they should look...it's totally up to you. Below is my set of pages in progress... So far I have 50 different favorites with lots more room to go. I think I may be able to cram 101 on there BUT this is taking some time. Someone posted it was going to be an easy one...you'd think so but it reality it takes a while to think of your favorite things....the first 40 are easy...after that it takes some time and consideration. At least it does for me.
You'll see I'm using a combination of hand written descriptions, stamps, ephemera, stickers and dimensional items.
Now of course you don't have to create your pages this way...you might draw out a grid and put a favorite item in each box or simply use photos of your favorite items or bits of ephemera, etc. It's really just to get you thinkin about the things that bring you joy!
Have fun with it :)