Ferns and Hostas always work well for me.

Adding in some bulbs like Bluebells, Aconites and snowdrops gives some nice early spring colour.

I've found that I can't go to far wrong with Polyanthus/Primrose too.

If you scroll down to the bottom of the page and click on 'S' and then on 'shade plants' you will get masses of info.

Many thanks, bluebells sound like a great idea, one of my favourites