hehehe.. so you have a marijuana machine! nicee!! send me the PSD of your start orb and I'll do it for you and you'll see for yourself when I send you back the PSD how it's made... it's a combination of a blurred white brush and a star shaped brush.
here's my PSD of Nuala Start Orb with the glow included. unfortunately I can't remember which brush I've used to create the glow cause I've got over 1000 PS brushes... all I remember is that the brush set was filled with stars. You might find something here on dA that suits you. in the mean time you can use the already made glow from my PSD.
depends on the background of the taskbar... on a dark taskbar looks perfect... not so perfect on a light one... and the way windows renders the start button is really really crappy so no mater what you do... in Photoshop looks perfect but when added to the start button the images gets ruined. thanks for downloading!