The Rainbow Eucalyptus is the most colorful tree on earth.
"The unusual phenomenon [of the Rainbow Eucalyptus] is caused by patches of bark shedding at different times. The different colors are therefore indicators of the age of the bark," Environmental Graffiti reports of the world's most colorful tree, "Freshly shed outer bark will reveal the bright green inner bark. This darkens over time and changes from blue to purple and then reaches orange and maroon tones.
Their explanation is certainly convincing, but the bright colors and sweeping strokes quickly lead one to suspect the work of a fairy's paintbrush!