This image is a combination of an image of Centaurus A galaxy and some star trails coming from it. The startrails were obtained from frames that were exposed after the tracking mount stopped. I processed the image of Cen A first and added the startrails next.
The color of the stars shows up best in the startrails.

Details
Evening of 2011-04-01 at the Painted Pony resort, Rodeo NM.
Astrotrack mounted Orion 80mm APO with 0.8x reducer/flattener to give f/4.8 and a modified Canon T1i camera.
Exposure 52-58s lights at ISO 3200 with darks to match for the image of Cen A. 13 matching frames were used for the startrails.
Processing in Images Plus, Startrail.de and Photoshop.