Hydrangea petiolaris is a great climber. It produces aerial roots and can glom on to just about anything and it produces these beautiful white flowers.
Mine was here when I moved in a dozen years ago. Apparently they can take up to three years to take off but are well worth waiting for. They don't really love the sun and are best planted with at least their roots in the shade. They can thrive even in a north-facing shady position. My hydrangea faces east and on the shady north side of my house.
