I do what Aaronmamo does. My printer only does 720dpi but its does the
job. The trick is to get the background color as close to your body's color as possible. I let the ink dry overnight then I apply some clearcoat to it. I try to cut as close to the logo as I can. Then I use a marker on the sides of the sticker to get rid of the "white edges".
And checkout
stickercity.com for some nice decals. They have "detailed images" of their products that you can use. You may have to distort some of them to use them on bits.