The burden is, in fact, on you to find a link from circa 2004-6 by Krugman calling for restraint of the bubble whose inflation he advocated so fiercely. See above for a more detailed exposition of this point.
Anyways, here is another article from 2002. I don't know how you can get any more incriminating:
Quoting Krugman: To fight this recession the Fed needs more than a snapback; it needs soaring household spending to offset moribund business investment. And to do that, as Paul McCulley of Pimco put it, Alan Greenspan needs to create a housing bubble to replace the Nasdaq bubble.
http://www.nytimes.com/2002/08/02/opinion/dubya-s-double-dip...
BTW, asking for a quote from 2004 calling for the creation of a housing bubble is a bit ridiculous: by then the housing bubble was in full bloom.
http://upload.wikimedia.org/wikipedia/en/c/c1/Median_and_Ave...
As you can see, late 2002 (when the above article was written) would have been just at the beginning of the disaster.
(sorry for the delayed reply; at work all day.)
If you find some quotes from 2004 or beyond where Krugman actually advocates policies that would encourage a housing bubble, then you may have a case.