For a brilliant splash of purple, consider 'Sugar Plum' Coral Bells (Heuchera). I have it edging a long border with bluebells and a white evergreen candytuft plant ( don't know name). They soon reproduce themselves too, so are good value.
Heuchera villosa Caramel Coral Bell, Alum Root Height: Short / Plant apart Bloom Time: Early Summer to Late Summer Sun-Shade: Full Sun to Mostly Shady Zones: Get Your Zone Soil Condition: Normal, Acidic Flower Color / Accent: White / White
Coral Bells - Green Spice - I planted one of these last year in my garden.
Heuchera ‘Spellbound’ Fancy-leaf Coral Bells The plant forms a large mound of ruffled, rose-purple leaves with silver overlay. A shady site produces more silver tones. Grow in part to full Shade; height is 8 to 10 inches and width is 12 to 16 inches.