Rather than use some non-standard control, what you should be doing is using un-obtrusive javascript to do it after the fact. See http://code.google.com/p/jquery-checkbox/ for an example.
Using the standard ASP checkbox simplifies writing the code. You don't have to write your own user control, and all your existing code/pages don't have to be updated.
More importantly, it is a standard HTML control that all browsers can recognize. It is accessible to all users, and work if they don't have javascript. For example, screen readers for the blind will be able to understand it as a checkbox control, and not just an image with a link.
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