Fr Tim Finigan's tongue-in-cheek proposal reminded me of the religious art and inscriptions often used to decorate matatus (minibus taxis) in my home from home Kenya.
Unlike Fr Tim, I was driving at the time I took the pictures, but then there is a lot more leeway in how road rules are interpreted in Africa. :-)
More leeway in road rules, but on the other hand there would be so little leeway for the irreligious, perverted and irreverent monstrosities commonplace in our "developed" nation that proselytisers for paedophilia (while hogging the media calling the kettle black) and the modernistic kitsch brigade would be laughed out of court or worse (justice is swift, brutal and spontaneous for those who viciously corrupt children or families).
That is not to say that Africa lacks its own religious kitsch, in abudance, and evident in these pictures, but this art at least has the essentials: it is reverent, it has faith, and it is not agitprop. That is more than can be said for much of what is being offered as fare for the papal "pilgrims".