Loads of pretty hardy grasses.....stipa Tennuissima looks wonderful all summer at about 40 cm high. And nice dark green evergreen foliage. Hackonochloa is a beauty......not evergreen but hardy. Beautiful yellow folkage marked with orange in summer. Good in pots too. In your half shade this would be perfecf if there is reasonable moisture. Carex testacea is evergreen ...lovely olive colour. Bowles golden grass is a stunner, everything about,this plant is yellow.....yellow swaying flowers in spring over bright yellow foliage and it loves shade. Check out elymus magellanicus....this has truly eucalyptus blue foliage that,is evergreen. The colour on this grass is as blue as any foliage can be. Some red grassss include Imperata red baron....Japanese blood grass...which is stunning in my garden right now. Other reds are uncinia unciniata rubra. Carex buchanii, and comans bronze form. There are loads of tall and very tall grassss that are,hardy ....check out the miscanthus family and Calamagrostis group. And a stipa called gigantea that truly is eye catching from spring to autumn at a height of 7' plus on a delicate, translucent plant.