Cimcifuga racemosa var. atropurpurea, Cimcifuga racemosa 'Brunette', Euphorbia dulcis 'Chameleon', Penstemon digitalis 'Husker Red', Rheum palmatum 'Atrosanquineum', different sedums. Wormwood is a good choice and so is varigated iris.
Ajuga repans tricolor, Polemonium (varigated form), Spiarea Little Princess, Eupatorium (I believe it's joicus) varigated with white flowers, Humulus lupulus aureous (golden hops vine), Lysimachia nummularia (moneywort), Artemisia limelight, Iris palida I believe is the varigated form and smells soooooo good, Stachy's b., many geranium (perennial) get a red tinge to their leaves, Ceratostigma plumbaginoides (plumbago, the perennial groundcover) turns fiery red late in the season, Physostegia virginiana varigated form, Actinidia kolomikta (male kiwi vine), Eupatorium rugosum 'Chocolate', Heuchera sanguinea Snow Angel, Origanum Kent Beauty,Berginia cordifolia their leaves turn red late in the summer, Caryopteris Worchester Gold, Dianthus grationopolitanus (Bath's Pinks) is grey/green leaved, Hosta-many, there is a variety of Chrysanthemum with varigated leaves, Honeysuckle japonica Aureoreticulata, Salvia lyrata-bronze-purple-and redtones (spose to have blue flowers (mine never flowered tho). Hope this gives you a few great ideas, have fun choosing...Kathy
Pix1 Origanum Kent Beauty
Pix2 Centranthus(pink), geranium Rozanne and hops vine (golden hops), intertwinning amongst the perenns.
Pix 3 Ajuga tricolor
pix 4 Dianthus grationopolitanus, (Bath's Pinks, or Ceddar Pinks) if you can see past the flowers the foliage is grey/green