There are plenty of hardy low-maintenance, low-water-use cactus and succulents that color a landscape without trimming or raking.
Brilliant yellow Golden Barrels (Echinocactus grusonii) will brighten a yard, particularly when paired with bright red Mexican Fire Barrels (Ferocactus pilosus). Consider a Purple Prickly Pear (Opuntia santa-rita) or a giant gray-blue Mescal Ceniza (Agave colorata).