That is pretty easy to make-- just draw some circles on a couple of different layers, and then mess with blend modes and transparency. If you are doing dark circles on a light BG, then multiply is probably the mode for you. Maybe play with blur or some blend modes, but it should be pretty easy.
not sure if this is a little late to be useful, but the term for that type of texture is I bokeh[/I]. you can turn up plenty of examples by doing a search for ‘bokeh’ or ‘bokeh backgrounds’.
here’s a collection of textures I had bookmarked. don’t believe any are on a white background, but still might be useful…