Ivy is self supporting and the large leaved, variegated types are easy if a little dull, not so good in sunny spots as they tend to get baked. Hyrdangea petiolaris is nice for shady north facing spots once you get it established it'lll slowly spread over the fence with white flowers summertime. If you can provide support i.e. mesh Clematis Montana is a terrific goer and two or three will easily cover a run of fence and provides masses of pink or white flowers may-june which are fragrant, the only issue is you'll need to keep it trimmed during the season or it'll want to take over the neighbours place as well.