If you're interested in 3D and folded-back curve quilts here's a few books that use these techniques:
Curves from folding back on the bias -
Peeled-Back Patchwork: Curves Without Piecing (good basics, nice designs)
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with Cathedral Window (traditional CW)Machine-Stitched Cathedral Windows
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Cathedral Star
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last two on cathedral window variations are juststunning but very complicated cutting and colour placementas most blocks are not based on squares)
Other 3D -
Three-Dimensional Pieced Quilts
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Fabric Squares & More
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Folded PatchworkOrigami Quilts
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more quilt than origame
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more origami than quilt