This is how I made one quickly.
I used a journaling card from the Project Life x Stampin Up Kit "Moments Like These" and added the date. You can add this in Photoshop,or hand write, date stamp, or add stickers. Lots of other options too.
Attach to back side of page protector. Will look like this:
Here are some other examples of tabs I've made:
A chipboard alpha tab.
I use journaling cards for my tabs. They're a good weight to work with.
I hope this has given you some inspiration! Thanks for stopping by.