im not a fan of the argument "cards similar to other cards are already in the game, so card suggestions can be similar to those already suggested". the cia forum is here to submit ideas to zanz. if the mechanic has already been submitted, what reason is there to resubmit it? the cia forum has been around for years (2, 3?) and ideas are continuously being pumped out, there are fewer and fewer novel mechanics left out there, which makes them more special and should be encouraged. saying "yeah, its similar, but its not thaaat similar' waters down the forum and hurts the search for new ways to improve/expand the game.
that said, i recognize that some people enjoy making cards 'for the fun of it', and don't want to hear 'simpsons did it.', so a less stringent section of 'just for fun' may be warranted. going further than that, i have long said that the cia forum is in need of fundamental restructuring, and even moreso now with unused ideas being harder and harder to come by as time goes on. but thats probably beyond the scope of which you were interested in discussing.