shade perennials?

shade perennials?

Speak to me, my gardening friends, of your favorite shade perennials viable in Zone 4 (avg. annual lowest temp is -20 to -25 F, or -29 to -32 C). I'm in college for Horticulture, and our semester project for Perennials class is designing a planting plan for a huge woodlot area that's mostly part to full shade. I do not want to do the ordinary thing and use a ton of hostas. Bonus points if the plant has white/cream, blue/purple or yellow flowers, but I'm open to foliage plants and ferns and such as well.
This is the kitchen from the other end of the living room

This is the kitchen from the other end of the living room

Heirloom Roses

Heirloom Roses

Fuzzy little plant

Fuzzy little plant

Grow-your-own Viagra craze hits Britain’s garden centres

Grow-your-own Viagra craze hits Britain’s garden centres

My room!

My room!

Garden Update

Garden Update