I vote for a darker colored, basically solid sashing with corner blocks of your scrappy fabrics. The corner blocks of similar scraps will help pull those tulips in the corners together to form your secondary pattern and the darker sashing strips will help calm the busyness and frame the blocks. A print border or two around the outside will continue on with the scrappy look. You have a very neat quilt in the making. It's a piece of art emerging, just keep helping it along. It will tell you what to do. Please post pics when you are done. I want to see what you came up with!