I love the groundcover sedums too, but here are two more that have worked well for me in sun: 1. Yellowroot (Xanthorrhiza simplicissima). It’s not one you walk on, it’s a low shrubby thing, but it’s beautiful. Clean green foliage, gorgeous bronze fall color, and in winter the deciduous branches give nice structure. About 1 foot high, it spreads like crazy. It prefers some damp. 2. The other is Arctostaphylos uvi-ursi (I know, a mouthful) or bearberry, also called kinnikinninik. Gotta love the names. It’s very low, mat-like, evergreen, and spreads. Has tiny flowers that look like blueberry blooms. This one likes dry. Neither one of these takes any maintenance, no shearing or trimming at all.