Yes, within the species Polemonium caeruleum, there are many varieties of different colors and sizes. Some popular Jacob’s ladder varieties are ‘Bambino Blue,’ a compact variety that has delicate, light blue flowers contrasted with yellow stamens; ‘Snow and Sapphires,’ a hardy variety that features blue flowers and variegated leaves; ‘Bressingham Purple,’ which thrives in shade and features light purple flowers, and ‘Stairway to Heaven,’ which has pink- or cream-tinged variegated foliage.