I don't believe that "look and feel" can usually be copyrighted. However, there are cases where apparent similarities in it lead to problems - for example where the lawyers for J K Rowling insisted on change in the cover of a book which was "too similar" to the Harry Potter series - though in this case the wealth backing those lawyers no doubt played a part.
In this case, creating the a mud with the look and feel of ROM is likely to result in the presumption that it is a ROM derivative, specially when the creator is an experienced ROM coder, and the problem is how to rebut that assumption.
In the case of the examples quoted by Trespassor, I don't agree that the look and feel are particularly "similar" - there are similarities imposed by the Windows interface, and by the functions which the products perform, but to me their appearance is substantially different.
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