What a gorgeous collection! You might want to do 2 quilts, one with the lace doilies and one with the solid ones. The solid ones could be put on appropriately colored background cloth and then worked together like a puzzle. That way you could accomodate all the sizes (that's the mathematician in me coming out). The lace ones could be backed with coordinated fabrics so that the lace stands out. You could quilt each piece based on its own design. Make a pieced border that brings all the colors together. ( I do well on paper, not so well at actually getting something fini - oops, not that word)