I guess it depends on the end result you are seeking. I like the colours you are using and if you are showcasing the quilting rather than fussing with details on the blocks, the solids will be great. If that is not your intention maybe some fabric with subtle patterning could be used sparingly on the block..for example on the wing area of the mockingbird, or a sky print for the background on another. Just maybe one "pattern" per block, just so it doesn't get too busy. Anyway, just thought I'd share my idea, as a lone quilter I don't get to do much "brainstorming" unless I stop by the board.
Look forward to seeing more blocks.