I would say any of the plants shown here;

Anemone, Aquilegia, Begonia, Centaurea, Convallaria, Cyclamen, Dianthus chinensis, Digitalis, Fuchsia, Galanthus,Helleborus, Heuchera, Hosta, Impatiens, Iris Lamium, Lilium, Linaria,Lobelia,Mahonia,Oxalis Polygonatum,Primula and Pulmonaria

I'm wondering about palms - most are perfectly happy without direct sun, but I am not sure what your winter temperatures are like there. Presumably the climate is dry? Or do you get regular rain?

Personally I would go for hostas, there are so many lovely varieties out there - some with white in the leaves which would show up brightly, and they can always be split to make new plants when they get too big for the pots they're in. :o)