thank you gifts for fertility clinic

Amy • 33, married, Baby boy after successful IUI
After nearly 8 months of being with them, I wanted to do something small to say thank you and goodbye to my doctor and the staff at my fertility clinic. I'm currently 6 weeks pregnant and have my fertility clinic "graduation" at 8 weeks (praying everything goes well) and move on to the regular OB.  Any ideas?
I need to buy for about 10-15 people so I can't spend a ton of money but want to do something thoughtful. 
One idea I saw was to get a small potted plant for each person and attach a note saying something like "Thank you for helping our family grow".  Too cheesy? 
Thanks for your help!!