If you want a splash of colour for Summer, here are a few suggestions:-
Sweet Peas are a beautiful, perfumed, dainty climber, available in a huge range of colours.
They also have the added bonus that if the blooms are picked for indoors this encourages more flowers to appear on the plant.
They are easily grown from seed outside, reach a height of approximately 1.8m (6ft) but do need support.
Nasturtiums do come in climbing varieties, available in yellows, reds and oranges and are ideal to cover a hedge or left to scramble over banks etc.
They can be grown from seed outside and will spread about 1.8m (6ft)
Black-eyed Susan is suitable for milder regions and has light orange flowers with deep brown centres.
It can be grown from seed germinated indoors, needs a sunny sheltered spot or greenhouse and will grow to about 1.8m-3m (6-10ft) in a season.
Morning glory again is most suitable for mild areas.
Available in blues, rich scarlets and purples, easily grown from seed germinated indoors and will grow to about 2.5-3m (8-10ft) high in a season.