Photograph the thing they gave you, still in use. That is a better thank-you than a text.

My sister gave me a chipped enamel jug in 2011 and it has held every pair of kitchen scissors I have owned since. Photographed it on the windowsill and got the same jug in the same place, shot the way you would shoot something that mattered — chip still there, scissors still in it. I sent it to her with nothing written underneath. She rang me instead.