In this case, all that glitters on your card should be an image. Select an image (rubber stamp or digi) and color it in using ONLY glitter. Glitter glue and glitter pens count, as long as the entire image is glittery!
Gloria managed this one beautifully, using a wreath from Sweet 'n Sassy stamps as her image:
Here's a close-up of the glittery goodness: