Hi Ballamory,
To be able to give you good advice - which way do the fences face - as what grows on south, east or west facing fences will not be the same for north facing ones.
My garden is south facing - which means I have an east, west and north facing fences - and a south facing wall (the house)... The plants on an east facing fence have to be tougher than those on a west facing one because they get the early morning sun - this is fine during summer but during frosts they warm up plants too quickly for somes liking and damage them.
I have ivy growing down the East facing fence - this is a wonderful tapestry of different colours of green and creams (varigated leaves) and leaf shapes - it is evergreen so is a feature all year round - loved by wildlife and vey easy to maintain - a light clip into shape once a year in spring is all it needs (the books would say twice - but the autumn pruning takes off all the flowers and berries which the wildlife need in winter)...
Down the opposite fence (west facing) I have different types of clemetis (spring, summer and late flowering) so it has a sucession of flowers and changes through the seasons - at the moment it is purple and white... but those are decisdious so for winter colour I would thoroughly recommend Pyracantha "Orange Glow"... fast growing, bomb proof (difficult to kill), lovely fresh growth in spring quickly followed by loads of little white flowers, followed by bright scarlett orange berries...
For evergreen plants I would recommend Euronymous... also known as the wall shrub... but they do equally well against a fence and will with pruning to encourage them grow up it... there are plain green ones and varigated ones, it is a matter of choise but I have one called Green and Gold (also very good for tubs and planters - easy to grow from cuttings - so buy one and propogate it)... I also have the original varigated one which is more green and white...
You could also consider whether you are just going to go for climbers (which will need something to grow up and tying in, and possibly clipping back) or for perenials which do well up against a fence - here I would suggest that Hollihocks are a good bet - yes they are old fashioned - but I have a jet black one - which is about 15 feet tall now and still going - it has the most amazing silky ebony flowers with white cenres and yellow pollen.. I also grew a delicate pink one from seed. Yes they have the drawback of getting rush - but for sheer flower power at this time of year.
Anyway, I hope this gives you some idea's...
Angela 
I should also add that I have problems with the north facing fence and have to completely re-do that border as the plant I put in is too vigerous and has outgrown its space in less than 2 years... but I have heard that the climbing hydrangea does well in such an aspect so am thinking of giving one a go.
Angela
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