hydrangea and wisteria - both have varied flower colors. Both are also seen in Old Southern landscapes. Hydrangea like rich damp soil with filtered sun. Wisteria will seek out light and do well in full sun.
Solar Garden border at Great Dixter, a house in Northiam, East Sussex, England - photo by Jonathan Buckley; Allium hollandicum ‘Purple Sensation’ with Campanula patula and Erysimum allionii in the Solar garden at Great Dixter