Hostas!
But there are lots of other cool companions, too...
Dicentra...I especially love 'Gold Heart' and the little ever blooming fern leaf bleeding hearts.
Arisaema
Epimedium
Brunnera...the silver foliage types are great.
Cimicifuga
Tricyrtus...lots of great variegated cultivars
Martagon lilies
Primula kisoana
Polygonatum
Polygonum...Stairway to Heaven is a good variegated one.
Podophyllum...the Asian species & new hybrids are nice.
Helleborus
Heucheras & Tiarellas
Trillium
That will give you a start