For a large background medallion, you could check out Holly Berry House stamps. Their medallions are especially cool, since you can stamp as is, or stamp several and cut progressively smaller layers to make an amazing 3-D effect.
I have both the SU! background medallion you're referring to, and PTI's Mehndi Medallion. The PTI set is beautiful, but much much smaller than the large background stamp you have.
HTH!
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