Love powers my heart and color powers my soul.

Love is spelt C-O-L-O-R.
And
Color is spelt L-O-V-E.

My soul pines for the color in my heart.

The depth of my feelings is proportional to the depth of the color.

If I am your rainbow, then you are my pot of gold.

When you get to the end of the rainbow, you haven't even started yet.