Cheap way to be nice to my wife

Hey all! Long time lurker here.

I have been going through a lot these last few months and I have decided to go back to school. And my wife has been super supportive in all of this and I really want to show her how much I appreciate it! I know I sound super boring but I used to buy her presents now and then back when money was not an issue, but now that things are kind of tight I would love to hear how you guys show your love to your partner in a frugal way :)