Please don't misunderstand, I am not much an advocate for the perfect expanse of greenness without a dandelion in sight. I always encourage ground covers to my landscape clients. Although not instant, which many insist on nowadays, ground covers are much more interesting , less time sapping and are often a great way to add even more flowers, color and texture to your yard.
I love the versatility of Walstenia, with the happy, bright yellow flowers in spring; sedums work well in tough spots and add texture and even vinca, although overused, has lovely blue flowers which draw your eye to shady areas.