I was able to find a solution thanks to Luis over at the Socialize Me blog:
http://www.lbenitez.com/2012/04/how-to-add-web-meeting-link-to-ibm.html
I was able to add images based on user ID through profiles-config.xml in both the JobInformation section (right under a user's display name in Profiles) and Business Card sections.
For example, using a web service request and iFrames:
<html prependHtml="<iframe src="
http://myIntranet/myEmployeeImages.aspx?id="/>
<attribute showLabel="false" hideIfEmpty="false" prependHtml="" appendHtml="">email</attribute>
<html prependHtml="" style="background-color:Transparent" Allowtransparency="true" width="100%" height="60" frameborder="0" SCROLLING=NO></iframe>"/>
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. . RE: Help - Adding Custom, External ... (Ivan Fong 17.May.12) 
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