http://monsterphoto.iwarp.com/runti.htm
Now that I look at this truck again, there were many versions with slight variations with different Bigfoot logos (as they were hand-painted). As far as I can see, these are the main two that were used:
Version 1 (yours) -- it wasn't long after the debut that the front bumper became solid blue. In the second photo you can see the true color:
Version 2 -- ChromaLusion paint that shifted from blue, to green, to purple. Standing still, the blue was the same dark metallic blue-green as the non-shifting paint. Had a solid blue front bumper: