Creeping Jenny can spread to 5 feet but it easily managed.
Veronica, also called turkish speedwell is a smaller plant with blue flowers in spring
Evergreen Blue Juniper
Blue Rug Juniper is low growing evergreen spreads 6 – 8 feet in full sun
Junierpus horizontalis ‘Wiltonii’ (Blue Rug Juniper)
Mother of Thyme, creeping thyme spreads to 18″ wide. Spring flowers
Shade Plant – Sweet Woodruf
Sweet woodruf spreads by rhizomes and can easily fill any space with only a few plants. may invade areas you don’t want.
Hardy Plumbago spreads 24 – 36″
Hardy Plumbago is a favorite of mine. Beautiful from spring through fall.