A large ficus or umbrella plant should do it! You may have to put them on some kind of plant stand to increase the height though. Maybe B&Q have some Easter weekend offers on? Don't know, but I'm going to have a look myself this weekend as Lily's ficus decided it would drop all its leaves and she's in need of a new one! I heard someone else say that Camellia can be used too, so I'm gonna look at those and see how big they are.