This is just a simple way to personalize your planner in no time!
You'll need some type of black papper, photo paper, a printer, scissors, some glue and, of course, a planner. It's easier if you can find a planner with a plastic holder in the front and back. These planners are made for you to diy them but if you can't find one you can always just glue your black paper on the front of the first page of your planner.
Then you just print out some photos. I made into the right shape and size in photoshop before printing to save paper and to know they would fit on the black paper but you can always just but triangles for a normal photo if you don't mind ruining them.
Just glue them on and wallah, it's done!
I didn't know what to do with the back so i just printed a picture of Dobby I took while visiting the Harry Potter studio tour in London :)