>>1675
How far north are you? In the warmer portion of the country, you might try for a grape vine.

>>1677 I'm in the south and thought about that but ruled it out. I just don't see it being any good.

>>1678
Well then what about a fanned or espalier fruit tree? I can tell you that cherries are crap because the birds invariably get all of the fruit, but apples, plums or pears could be nice, or perhaps even gages, medlars or figs.
Not vegetables as such, but it's always nice to have food from the garden.

>>1679 I'm all for food from the garden but I really wanted something to climb up the wall. A fruit tree is not really what I'm after.

Passion fruit would be your best bet, you get some nice flowers and lovely fruit. Though you do need to check out which variety your buy since some of the fruiting varieties are fucking rancid. Being on a sunny wall they should ripen fine.

>>1681
They do require some care, though. In good conditions they can ramble out of control quite quickly if not tended to.

>>1682
I suppose I forget about these things living in a fiarly moderate climate, they are suceptible to frost and will need to be properly trained along wires. otherwise they start anchoring into the mortar and fucking up the pointing on the wall/ taking off any rendering. Just chek about to see which variety works best in your soil type and what type of fruit they give. Many of the larger varieties are watery and insipid and some of the varieties are not going to last very long once ripe.