Wildly colorful Garden Croton (Codiaeum variegatum) plants are common in Costa Rican Gardens. In non-tropical areas, Garden Crotons are commonly grown as houseplants. These brightly variegated plants are in the Spurge Family (Euphorbiaceae).
I love colorful foliage plants. They also are perennials and would come up here after year. I think this is a beautiful idea to plant these hosta type plants under a tree with all their different colors