It really isn't all that hard to dedoop a template, if it is a concern. And from an SEO point of view, it's probably a good thing to do any way...First, change the names of any/all graphics, including "spacer" graphics. Do a search/replace in the html, then remember to change the file names accordingly, using a few "keywords" strategically.
Next, you can modify the tags...For example, a simple table tag can be written a number of different ways without affecting the layout in any way:
<table>
...Can become:
<table bgcolor="">
<table width="">
<table width="" bgcolor="">
<table bgcolor="white">
<table bgcolor="#ffffff">
All the above will display exactly the same, but will alter the template's html code.
Same thing can be done with <TD> and other tags.
Try changing the order of the elements in the <head></head> tag, maybe add/remove CSS, meta tags, etc.
If this is something that is of concern, then it only takes about 20 minutes to make some decent changes that make the template more "unique", if you have some html skills and a little creativity.