Die Cut Letters
It's the most used and most appreciated teacher's gift I've ever received!
Recently, a teacher asked if I used a Cricut for the letters on the FCCLA bulletin board. The answer is "No, but I will if I ever run out!"
When I got my first job 29 years ago my step-mom gave me this file box filled with laminated letters of different colors and fonts. As you can see they haven't faded. She used a die-cut Ellison machine (we have an AccuCut at my school).
Over the years I've stapled letters and reused them. Other times I've permanently glued them to sentence strips and laminted for bulletin boards that I will repeat each year.