I guess these are all user contributions that eventually became popular and thus made it to the catalog. Upload yours already, give it a distinctive template name so people will find it, and hope for the best.
Doesn't work for me -got to frustrate you again ;)
this is what I get when I add that image inside (no transparency).
make sure your image contains transparency - then use .png format to save&upload it.
I thought it would accept transparency from a GIF. So I converted it into a PNG and uploaded and now when I search for it it doesn't show up in the composer. It's listed among my personal templates but I can't use it on top of another image. I'm going to call it a day and let somebody else figure out this broken mess.
The other cap was great as it had that rounding which comes in handy if you paste it on a head.
I guess you mistakenly uploaded it as a .jpg and not as a .png - so the transparency was lost (this is what it said when I checked the other template).
It should work though if you upload it as .png - give it another try!