Hostess Gifts!!

So my mom is planning my bridal shower at a local pottery painting place near my house. We’re decently friendly with the owners, and when they started offering this particular party, they called us immediately because they thought we’d love it! (Super nice!) At the party, everyone is given a tile to paint, and once they are done, the tiles will be grouted into a coffee table or an end table that FH and I get to keep! It’s really precious when all is said and done.

That being said, I know I’ll get my mom a hostess gift since she is doing all the planning, but I really want to get the two ladies that own the studio a small gift as well! They’re letting us have the party after hours so we get the whole building to ourselves and they gave my mom a discount on it because “Oh, we just love Kaleigh and Lucas so much! We want to help any way we can!”
FH suggested a nice thank you card and a Starbucks gift card, but I’m not sure. Any suggestions?