Not the slickest mockup, but this framed print caught my eye with its happy colors that would help marry your blues to the red brick. This is 40" x 40", and not sure how that size would work on your wall, but I'd go as large as would look good proportionately in that space and make a statement with it.
https://www.art.com/products/p42922813081-sa-i10136534/jill-martin-laughter.htm?upi=PZ8WUIZX3XQ&PODConfigID=13198930
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love this
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