My decision would be based on the size needed. I think it would look nice with a border, if it wouldn't make it too big. If so, It looks lovely without a border.

Very cute.

You did a great job!!

I believe borders give the finishing touch. But, it's whatever suits your fancy.

Very cute!

Uber cute! I say no border, I like it just the way it is.

love the happy colors

This is so colorful, I love those pinwheels. Nice job!

I agree with janRN. It would finish off nicely & the child could enjoy for a longer time.

How big is it already? I like borders even if its a narrow one. Very cute!