If you want to send a special card or thank you card, my sister also made it into a fold-over card. It's super cute, and I can't wait to use it! (She blogs at Ensign Insights and also sells hand lettered prints.)
Free One in a MELON card
In my search for inspiration I found a bunch of other free "fruity" party printables!
Groovy Fruit printable for straws - I taped them to my paper cups.
Foldable Fruit Printables - I made these, and they are fun and not too hard to put together.
Feeling Fruity Party Printables - This has a whole coordinated collection of free party printables!