Here are the things you need to in order to make two:
Matching thread for your machine
Four sets of snap buttons
1. Trim off the sides of the fabrics. Cut 4 1/4" wide strips.
If you would like to have more colors shown closer, you can cut your strips narrower during step 2. Depending on the measurement of the wristband you are making, you can always add or take away the strips to adjust it.
I hope you will have fun with it.