[[Category:Stickers]] should list all the existing templates that use the base sticker template.
an image of the medal is shown on the category page, but if you want it on a specific profile, there is a {{Medal}} sticker that was created for the highest medals that can also be used to display any medal such as the Silver Star Medal on a profile... but it is the reduced size, small box on the right side...
{{Medal
|image = Photos-271.png
|Medal = Silver Star Medal}}
if you want a larger image to display on the profile page, you can do it with
{{Image|file=Photos-271.png|align=c|size=200|caption=Siler Star Medal}}
align=l for left, c for center, r for right
size=number is how large you want the image