Fatsia Japonica might suit your needs. It is like an outdoor version of a cheese plant. An evergreen with big shiny leaves. Aquilega is very pretty, aka "grannys bonnet" it will flower in June. Climbers like honeysuckle, jasmin or clematis are quite hardy and can be supported in pots with stakes. Bamboo is another evergreen which requires little care, but because it is trendy now, it is quite expensive. Lavender, rosemary and camomile will give scent as well as flowers (full sun). Budleja aka butterfly bush has a lovely scent. Which way does your garden face?