I'd add a narrow stop border -- probably 1" just so that the blocks aren't cut off. But I could also picture it with a wider white border of 4-5" with all sorts of little motifs throughout.
When I saw this, I almost immediately thought the center looked like bee hives & the yellow blocks looked like bees (or butterflies -- that wouldn't really go with the bee hives as much). If I were putting on a wider border around it, I'd go with plain white & quilt it in white with all sorts of bees, butterflies, flowers & jars of honey going every which way.
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I'd also quilt the center in 40wt white Aurifil (#2024) -- except for the bees which I'd do in black (#2692). Then I'd bind it in a small yellow & black stripe.
