The images below underline just how colorful these rainbow type spas can be.  These photos are ones I shot of Joe DiPaulo's rainbow spas.  The colors reflected in the water as the light passes through the colored translucent bricks can be spectacular.  The bottom photo is taken with me setting in the spa, dome of color bricks surrounding me and Barbara's face reflected in the glass.  I used a very wide angle lens which resulted in an interesting image distortion of the dome.  For me, sitting in a rainbow spa is like sitting in a work of art - J Guild