The Signature Series was a program where an artist would design a model, and then the Stone Co employees painted them. Each model had a stylized sticker of the artists' signature, and came with a Certificate of Ownership.
Ladybug and Firefly were sold as a set. Both chestnut blanket appaloosas designed by Laurie Jo Jensen. There were estimated to be 250 models made in glossy and 250 made in matte finish.