If there are children living in the house or regularly visiting, then space may be created for them to run around in, play ball, have a sandpit or climbing frame. If there is room, space may be fenced off for any dogs who live in the house.
The garden can provide food for the kitchen. Even if there is not space, or the inclination to grow a whole range of vegetables, it may be possible to grow a few varieties such as some salad leaves or a trellis of runner beans, perhaps interspersed with sweet peas. A couple of soft fruit bushes would fit in between a collection of flowering shrubs and a selection of plants may be grown to provide cut flowers for the house.
It may be worth looking at www.trampolinepad.co.uk if considering a space in the garden for sporting activity such as trampolining. With planning, a garden can be created which will enhance not only a house, but also the lives of the people living in the house.