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 an orange butterfly and a smaller pink butterfly. When their enemies emerge from the ground, the colorful shapes gather together and use the power of the sun to vanquish their foes.
There are also rumors for the Colorful Triangles to appear in Fantasia: Music Evolved.