I don't think a border would be needed unless you need the final size of the quilt to be larger. Any darker fabric will work for the binding. I am sure that your grandson will enjoy this gift you made for him.

That is a great design for an I Spy... and it doesn't need a border unless you just want one. I personally like my I Spys pretty busy. Just bind it!

I agree a border. Your quilt is great and I know he will like it

I love it, what a great I spy quilt - I've never seen one done in triangles before. I might bind it with a dark blue or burgundy.

Great I Spy quilt and agree it could use a small border.

A dark blue binding. It looks great

Normally I like borders on everything, but with this quilt I am thinking a border might box the design in, I am not expert. I would try laying some dark fabric under the quilt with just a border length showing on all sides if you can (even if it's different colors) just to see what happens when you put on a border.

I agree with a dark binding, no border.

It is an awesome top....I would vote for a dark border....am going to have to check out the I Spy pattern....love it!!!

I think it would look nice with a blue binding and without a sashing.