A true variegated beauty, H. heuschkeliana ("hoysh-kel-ee-AH-nuh") is a vigorous and easy grower, though not often seen for sale.  Its flowers are amazing, too, and many growers describe their scent as being reminiscent of movie-theater buttered popcorn!  For best color, grow these in bright, indirect light, but never full sun.  Hoyas enjoy deep watering with a chance to dry slightly between.