My niece, Bethany Tobin, is not only one of the angel singers on Indian Summer and Hallelujah! Amen., she is also an artist. Her work is on the cover and booklet of Indian Summer as well as this website. This particular painting is called Veni (for Veni Sancte Spiritus) - that's the music behind the colors. It's actually a close-up section of a larger painting - maybe about 3x2 feet or bigger.