Ajaxload.info allows you to replace the default spinner.gif image for your TNG installation with a custom made for your site's colours etc.
You can choose from a wide range of spinners, progress bars etc.
It could be handy in choosing a spinner to match the color scheme of your TNG template.
Note that TNG is coded in a number of pages for the spinner.gif icon to be 16x16 pixels, so you won't be able to change to anything other than that size without unexpected results.
Provided by Roger Moffat on the User2 list