These are not bulbs at all...they are electroluminescent panels. They are flat, and use an voltage converter unit to excite the panel to glow (small 1"x1" black box that steps up voltage at very low current levels). And yes, you can change colors. You can purchase the raw panels from eclectic > www.e-clec-tech.com, then retro-fit panels in place of the original blue. Interesting project that would be...they could be red, pink, whatever...I have changed my entire interior lighting to deep blue by retro-fitting all green bulbs with various blue leds (try superbrightleds.com)...have fun!