I use these homework passes as a positive incentive for students to perform well on assessments. Students that receive a 95% or higher earn one of these cards, which excuses them from a homework assignment of their choice.
It is recommended that these cards be cut and laminated after they are printed. You can also sign the cards before laminating, or paste a scanned signature, to prevent students from counterfeiting the passes.
Using this simpler form of reinforcement saved me quite a bit of money, as I used to reward this type of performance with a treat.