Something like this?
(if you're using IE6 or earlier it will appear to have a grey-ish background but that's just because IE6 doesn't support PNG transparencies. If you printed it it should have no background)
(click for full-size)
ADDED: Hmm, the ribbon doesn't look like it's in the centre. I'll try and fix it.
ADDED:
ADDED: P.S. I do not have permission to use that ribbon image and as such I cannot give you permission either. Shouldn't matter though if you're just going to put it on a couple of t-shirts. :/