The Colorful Triangles are abstract shapes from Symphony Number Five, the first segment in Fantasia 2000.
They represent the cause of good and act like butterflies or birds. The most significant of these are a large orange butterfly and a smaller pink butterfly. The Colorful Triangles then witness darkness arriving in their area noticing that danger is emerging. When their enemies emerge from the ground, the colorful shapes gather together and use the power of the sun to vanquish their foes. Later when the Colorful Triangles use the power of the sun to defeat their enemies, they manage to get inside the power of the sun.
There are also rumors for the Colorful Triangles to appear in Fantasia: Music Evolved.