Encourage climbers to climb. Or conversely, allow them to hang downwards from a height, in which case many of them will attempt to fulfill their real function and will turn the ends of their long trails upwards in the most elegant manner.
Beside the little wine serving table in the dining-room stands a plant of Philodendron imbe, usually known as Burgundy because of the deep, rich, wine red of its lanceolate leaves and in the bedroom are several soft, intimate, dainty and delicate plants of African violets, seldom without flowers the whole year through. In the kitchen grow pots of quick growing and easily replaced chives and mint and the elegant cone of a little bay tree.
Vivid colours, yellow, orange, white and brilliant red are advancing. They come out to meet you and so tend to make a room appear to be shorter if placed at the far end. And conversely, dark colors, mainly greens of course, are receding and tend to look farther away than they really are, thus lengthening a short room. A tall rubber plant or fatshedera will make a room look higher, for the eye tends to follow the growth upwards, while a high ceiling can appear to be lower if horizontal growing plants catch the eye.
An impression of warmth is given if a wall is covered with the trained tendrils and shoots of a growing plant or if warm colors are used. And as might be expected, a hot summer day can be cooled indoors by the decorative use of cool greens, purples and dark colors in general.
Look at your plants carefully, determine their basic characteristics, shapes and habits and then utilize these to the full.
Remember that warm air travels upwards and the area immediately under the ceiling is likely to be both warmer and drier than at foot level, so where plants are to grow tall or be placed high, increase the relative humidity of the room slightly for their benefit.