Most Colorblends are designed to work in both small spaces and large, so the number of tulip varieties is typically limited to two or three. Really big areas allow room for more elaborate displays that cover a greater range of color, bloom time, height and texture.
Hence: BedSpreads. These blends comprise four, five or more varieties and are packed only in bulk quantities of 500 or 600 bulbs. Where a duet or trio would be nice but a symphony would really resound, try a BedSpread.