One problem with the request is that usually scientists don't go around saying "my paper was rejected by such and such a journal", we usually knuckle down and fix whatever major flaw(s) had been highlighted by the reviewer or resubmit to another journal with lower standards. When I review papers I don't expect my comments to go further than the journal editor and authors. I expect the same is true in other fields, so unless Creationists have submitted good papers that are then turned down on spurious grounds and then make a fuss over it we'd never know. So, whereas it's possible for a Creationist to come along and say "I had such and such a paper turned down" to prove one side, the lack of such a statement doesn't mean it's not happened.
Though I'd guess that Creationists are fairly likely to make that fuss, thus providing the examples you're looking for.
Alan
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