Clematis 'Early Sensation' has it all. Beautiful pale lemon petals fade to creamy white over time, a striking contrast to pale green stamens and darker green leaves. It's also fragrant, evergreen and easy to grow, needing little or no pruning. 

It will need something to climb up though as this is a scrambling rather than a clinging clematis. 

Protection in winter may also be needed as it's only frost hardy. 

Clematis Early Sensation is a Forsteri Group Clematis.