I have made up 18 fast finisher cards that can be stuck to paddle pop sticks or simply laminated and kept in a special place for students to go to.
They are simple activities that don't require anything other than a piece of paper. In my hypothetical classroom, all of my students have a spare book where any activity that they select can go in. This will avoid the students asking where to complete the activity or spending time looking for scrap paper.
Also, you can edit the boxes so you can create more or change them up!
I hope you enjoy :)