Nope...SSI = Server Side includes

What you could do though is add additional params into the search query string that could allow people to custom the search results page.

Example:

&logo=http://www.someotherdomain.com/image/logo.gif

Then in your search result template, you could put:

<%if logo%>
<img src="<%logo%>">
<%ifnot logo%>
<img stc="<%defaultlogo%>">
<%endif%>
========================================
Buh Bye!

Cheers,
Me