Ficus virens is quite suitable for larger bonsai. It has attractive leaves that in some cultivars can be quite red or bronze on the new foliage. Thailand growers have developed some that are very red. The red color in the leaves will persist for a week or two before turning to a deep, deep green color.
In the photos above you can see that the mature leaf color varies from seedling to seedling. Some show a fair amount of red or bronze-tinged foliage. These plants are all about 7-8 years old from seed.