My choice would be a random placement for the existing blocks. For a color fade, I'd be making another light red/pink/coral, and remove the darkest blue.
Layout:
Dark red in the upper right, then going diagonal, two mid red, then three lighter red (one new). Then four using the yellow and three oranges. then another row of four, using the four of the lighter green (and the blue/green since the green in that one is light). Next row would be three darker green/turquoise blocks. Then two blue and the purple in the lower left corner.
Another thing that helps with color fade, move from light to dark in the diagonal row, so where you have yellow and three oranges, example would be put the yellow at top, then the lightest orange and the darkest orange at the bottom. The next row, put the lightest green at the top and move down to the darkest green at the bottom.
Last edited by Macybaby; 01-16-2018 at 07:09 AM.