The 7-Up acid trip logo on a fading sign, at the one and only cafe in Strandquist, Minnesota (though there is also the Rainbow Club, oddly enough).
See this photo on Flickr
www.flickr.com/photos/stockholm_cindy/31937461/.
And there's another one here:
www.flickr.com/photos/duien/86525971/
And yet another here:
www.flickr.com/photos/ericablu/5616217/