I wouldn't use a print of any type. I think it will detract from your embroidery. Stick with soft colors from your embroidery so that when your quilt is viewed the main point of interest in the embroidery, not the sashing or the borders. I would even consider sashing it in the same color as the blocks are made in, and using the color or the border the same as you would use the color of a picture frame. Keep all the interest on your blocks.