The Corkscrew Hazel
I saw this in a friend's garden a few days back and was taken by the wonderful leaf tones as well as the quirky corkscrew form. I assume it is one of the coloured forms of Corylus avellana contorta - possibly 'Red Majestic'.
Given that the leaves will also produce autumn colour - the young leaves actually turn from red to green - before producing autumnal colours as they prepare to fall.
Plus you get good winter structure and catkins in the spring. Definitely a good value shrub / small tree.