So far all I got into it is $14 and a safety flag/whip that I already had. I bought a 16ft reel of RGB LED from fleabay and coiled it around the flag pole. It has 3m adhesive tape and is waterproof, but not the connections. I want to put some in each fender and I still gotta get a switch and wire it all together.
(http://i85.photobucket.com/albums/k79/sdn1746/The%20Grizz/IMG_20130318_193145_zps8a4e3999.jpg)
(http://i85.photobucket.com/albums/k79/sdn1746/The%20Grizz/IMG_20130318_193232_zpsf642cd18.jpg)
(http://i85.photobucket.com/albums/k79/sdn1746/The%20Grizz/IMG_20130318_204626_zps0ca4d212.jpg)
(http://i85.photobucket.com/albums/k79/sdn1746/The%20Grizz/IMG_20130318_204635_zps1a0c0f27.jpg)
(http://i85.photobucket.com/albums/k79/sdn1746/The%20Grizz/IMG_20130318_204652_zps049d405c.jpg)
(http://i85.photobucket.com/albums/k79/sdn1746/The%20Grizz/IMG_20130318_210426_zpse2065fb4.jpg)
Home made LED whip. (http://www.youtube.com/watch?v=3WdFQjmznFY#)
If I were to do it again I think I would buy a solid green one instead of a multicolor, seems like it would be even brighter. But still not bad for what I got into it.
Be careful not to simultaneously-display multiple colors, it gets some folks skeered shirtless and they go running for their Rockwell orifice protectors!