I had an extra stash of sandcastle molds that I bought for a party. I figured the teachers kids' could use them this summer. I bought some trailing plants that coordinated with the colors of the sandcastles, so if they decided to keep them in the castle they would look nice.
I turned the castles upside-down to create these whimsical flower pots. I punched holes in thank-you notes, wrote personalized cards for each teacher, which I looped thru the mini-shovels with a ribbon. Ta-da! Easy DIY Teacher's gifts.