Ditto Brush&thimble's comment - I was thinking that fabrics that 'read' as solids would be much more dramatic than solids - would add a lot more dimension and texture to the design.
http://www.thousandsofbolts.com has fabrics organized by colour and a large selection of tone-on-tone blues :) <no affiliation, but have purchased from them happily>
Nice design - have fun with the project!
Linda