well the genuine bull who "donates" his testicals for a purse,
or other item no longer is...

see these...http://www.hitchcorner.com/bull_balls.htm

I have seen truck decor that looks more realistic than the
molded plastic models...maybe made with pink suede--
keeps you guessing...

i prefer propellers...
http://www.hitchcorner.com/hobbies_covers.htm#propellor

although they may be a bit distrating as they rotate as you drive..