If you think you have enough green in the room already, go for the Euphorbia 'Mrs. Iceton' (Codiaeum)! This plant has brightly coloured foliage. Shades of yellow, red and brown are all in there. If the plant's leaves turn a darker colour, move it closer to the window. The indoor plant also has an air-purifying effect. Impurities in the air are absorbed and broken down.
Give the plant some plant food once a month. Find the plant in a spot in partial shade. Water the plant twice a week.
These colours give us a warm feeling!