Hello,

noavatar.gif is the default avatar for users. It's not defined on a template, it's defined in another file "includes/functions.php" , just search for "noavatar.gif" in there.

logo.gif depends on the template. I think only "dark" template would have it, it's on "templates/dark/main.php". If you're using some other template and it has a "logo.gif" then it would likely be on "templates/*/main.php" as well.

Regards,
Hans