I would make a fancy card saying something like "A gift in your honor has been made to <whoever>.
One guy I worked with once was such a whiney-baby, I sent him one saying La Leche League. I found out where they were meeting and brought donuts to go with all that milk. I left a post-it on it with "A gift from " <his name>.
It was worth it, still bringing a smile to my face years later. There are too many ways, that you can combine good intentions and good actions.