The quilt is well worth the time and effort you have put into it. It's just plain fun to look at! I'm thinking may be a whimsical applique leave border.
I think the leaf/stem shown here would be cute as a border on your quilt …
https://blog.patsythompsondesigns.co...apunto/page/13
Here's a cute border print:
https://www.fabric.com/buy/0535158/m...-border-spring
Just brainstorming here ...