Not fully contemporary (in some of its specific ad references) but Stan Freeburg's "Green Christmas" is a classic satire and protest of the commercialization of Christmas.

There's also a sad Spanish Christmas song called "Pobres Huerfanitos (sp?).

Tish Hinojosa also has a song called "Jesse" on her Christmas album (tape or CD) about a girl in the housing projects. It's a positive outlook song but I think you might find it fits with your category.

I also have some "alternative christmas carols" (parodies about the excesses and abuses of Christmas) which I can email you if you like.

If you're looking for silly stuff, of course, there's "Walking 'Round In Women's Underwear," and "I Yoost Go Nuts AT Christmas."