I can't find any research on them so I'll be taking notes and letting you know how they perform in my backyard!
Another colorful shade-loving ornamental is the Persian Shield, Strobialanthus dyerianus. Very drought-tolerant, easy care, no pest issues, and provides psychedelic colors of purple, gold, green, and many other colors depending on the light. It can grow to 5 feet tall in full sun, but in the shade it will only get to be 2 - 3 feet. In full sun they will need more water and suffer stress.
I'll be talking about citrus problems in your backyard with Charles Fedunak, Lake County's Horticultural Agent. If you have orange, grapefruit, or tangerine trees, you won't want to miss it!