If you're lucky enough to live in a climate where Lantana is hardy, you probably have it growing as a shrub. It also trains easily into a standard or small tree and I've seem many gardeners in colder climates do this and over-winter the plants indoors.
Lantana flowers are often bi- or tri-colored in wonderful sherbet shades. As with all the plants listed here, they bloom throughout the summer.
All parts of this plant are poisonous and can cause skin irritation, so handle with care.