My idea would be to get some large tubs and plant them up with hardy exotic plants. There are some absolutely stunning plants out there which will easily survive the British winter and will make you feel like you're sitting in Thailand or Brazil.
Unfortunately, nothing's cheap. You could always walk round markets, boot fairs and bric-a-brac shops and try to pick up some quirky planters....it's surprising how good a pair of wellies look when filled with compost and planted up with trailing begonias. Even a small group of baked bean tins can look good with a small plant in. Think outside the box a bit, if it holds soil, it can be planted up. Thant way you can have a seasonal colourful display of bedding plants mixed with exotic foliage of palms, hardy bananas and Phormiums.
Don't forget a small water feature too.....again if someting holds water, it can be used as a small water feature....it would be good if you can run an electric cable out to get a small pump in there for a fountain.
Hope this helps a bit.