Okay, here’s what I know about the “De Colores” bumper stickers… There’s this, I guess group, of members from several churches of all different faiths that meets and does good works together.called Cursillo You get “initiated” into this by being sponsored by someone who’s already a member and you go on this weekend retreat with several others at the same time. They make all the meals for you, have workshops, etc., and one of their big things is they teach you this kids song in Spanish called “De Colores” and they sing it all the time. It became their big thing and when you meet others who are in this group, you greet each other by saying, “De colores!” and the bumper stickers are like a flag telling other people that you are in this group.