Although we do not have a canned graphics library, you can get bitmaps of buttons and other controls to use in your interface from iStockphoto. There you will find good quality graphics, for a low cost. Do a search on “buttons” to see a sample. Some other options: Free SVG or find other image galleries.  You can use Inkscape to convert a .SVG to a .BMP. You might also consider using a tool like GIMP. See Reach Technology video tutorials for making graphic elements. You might also consider working with an interface design firm like GUIFX.