I found these today...
If you Google search them, they are all over. There are even t-shirts and tote bags and sweatshirts. Of course it would be really hard to pick just one color, but I like the charcoal gray one because it could go with practically any color scheme.
I can totally see it hanging in my kitchen or laundry room one day -- a bunch of muddy, gross kids run in destroying the hours of cleaning I had just done, I glance at the poster and just shake my head. : )
I'm sure they will still be around in 4 to 10 years when I actually start having children, but of course I need one now.