As labels go, 'ground cover' doesn't rank high for excitement. It sounds utilitarian: soaking up pollution in car-parks, or hiding parts of the garden you can't do anything with. But its name belies its potential loveliness.
Ground cover plants survive and even thrive in challenging situations. This can apply, for instance, to the ground below deciduous trees. Trees can take up most of the moisture and nutrients from the soil, and cast shade for much of the year.