Err, no masterswordman, the .psds of the infested texture overlays are freely available to mappers. I'm not quite positive, but I think they may have been in the NS media pack, which you can download from the files section of ns.org. Hopefully that has them, if not, you'll have to do a search of the forums.
They are in the media pack, never knew that they were freely avalible to mappers <!--emo&:angry:--><img src='http://www.unknownworlds.com/forums/html/emoticons/mad.gif' border='0' style='vertical-align:middle' alt='mad.gif'><!--endemo-->
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I'm not quite positive, but I think they may have been in the NS media pack, which you can download from the files section of ns.org.
Hopefully that has them, if not, you'll have to do a search of the forums.