First let me ask this... Do you just have one layer with everything on that layer (i.e. background and photo corners )?
I usually create my elements on their own layer and nothing on the white background layer. Then when I'm ready to save the element to share with others I turn off the background layer in the layer palette and save as a PNG.
If you have everything on one layer you'll have to select the background and delete it. Then you'll end up with just your photo corners left on the layer.
Does that make sense or help you out any?!?
