I've always called them a pre-printed panel. But I imagine everybody has a different name for them. Just remember when you cut them apart to be very precise. You have to have the 1/4 inch seam allowance. To choose a color for sashing, just lay out different colors of fabric beside the panel. Use colors that are in the pre-printed blocks. Use the colors you like. Try to use colors in the same value. Don't go real real bright/big prints. Maybe use small prints so the print doesn't take away from the blocks. Have fun.