Jesus said "render unto Caesar what is Caesar's" but was not much for honoring and tending to the worldly needs & vanities of the powerful. Also, verse one of the passage hints at the purpose, "Now before the Feast of the Passover, Jesus knowing that His hour had come that He would depart out of this world to the Father, having loved His own who were in the world, He loved them to the end."
IOW, on the eve before he washed away their sins with his blood, he symbolically washed the grime from their feet.
Check out verses 7 & 8, where Jesus makes it plain:
"Jesus answered and said to him, "What I do you do not realize now, but you will understand hereafter." Peter [!] said to Him, "Never shall You wash my feet!" Jesus answered him, "If I do not wash you, you have no part with Me."
So, no, OBL as an outspoken unbeliever gets to meet God with his sins on his soul and grime on his feet. If OBL has a change of heart and comes to believe Jesus is is savior, then alrighty with the Almighty making OBL's feet clean & whitey.
To sum up, those responsible for the image are clueless as to the meaning of the passage. I am reminded of the scene in A Fish Called Wanda where JL Curtis dresses down the K Klein character about his total misapprehension of the philosophical and religious works he has read.
Wanda: But you think you're an intellectual, don't you, ape?
Otto: [superior smile] Apes don't read philosophy.
Wanda: Yes they do, Otto, they just don't understand it! Let me correct you on a few things; Aristotle was not Belgian! The central message of Buddhism is not "Every man for himself!" And the London Underground is not a political movement! Those are all mistakes. I looked them up.