[Conservative til I die]

So basically, Congress can order the redesign, but the Treasury has final say on the actual design. Thanks for cearing that up for me. Does Congress have to approve the design though?

[Timesink]

Does Congress have to approve the design though?

No, but the way this is set up they could of course just order a redesign of anything new they didn't like. That would require a standard bill that would have to be signed by the President, though. Here's the process the State Quarter bill went through. The 'Toon signed it into law December 1, 1997.