It might look like someone painted these by hand, but the only artist responsible for these living works of art, is Mother Nature.
The incredible looking Rainbow Eucalyptus is the only species of eucalyptus that grows in the northern hemisphere. It can grow to impressive heights, of up to 70 meters, and it is normally grown for its pulpwood, used to create white paper. There are many other interesting facts regarding Rainbow Eucalyptus, but the obvious question arises: why does it look like it’s been painted?
The secret behind the Rainbow Eucalyptus is actually pretty simple. The trees shed multiple patches of bark every year, but not at the same time. As the patches are gone, the green inner bark is exposed, and, as it matures, every new patch first turns bluish, then orange, purple and maroon. This creates the rainbow effect that makes these trees so nice to look at.
Rainbow Eucalyptus can be found in New Guinea, New Britain and the Philippines. (Source)