Nurse gifts?

So I've already had to go to labour and delivery once for contractions a couple weeks ago, and the nurses there were AMAZING and never made me feel like my going there because I was scared was unreasonable. I just know that they are going to be equally amazing (or even better) when I do give birth in a few weeks. I want to do something nice to let them know I appreciate everything they do. I knit all the time (if I'm sitting, I'm knitting), and was thinking about leaving them a big basket of mittens when I'm released from the hospital. Should I do something more? These are extraordinary people and I just want to show them how wonderful they truly are.