Hiya Alan. Not sure about climbers to fit your criteria. I grow a lovely ivy called Buttercup that grows in sun and partial shade. The leaves are a beautiful shade of yellow. Gold heart is another ivy I grow. It's a bright variegated form I think may grow on north wall. Watch this space though because I'm pretty sure someone will have a suggestion or two for you. Pyracantha is a "climber" of sorts....easily trained against a wall, white flowers and yellow, orange or red berries and evergreen