Here are a couple of idea for you. Both are super-fast to piece and you can do a walking foot grid or fancier quilting and they turn out looking great!
This first one is essentially a modified rail fence layout with the center strip wider than the two outer ones. You could alternate center strips to use 3 fabrics instead of 2:
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And this one can be used with a panel, or just patterned and/or solid fabrics as I have done:
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