Just noticed a List over at BGG that lists games that could benefit from 5- and/or 7-sided dice (http://www.boardgamegeek.com/geeklist.php3?action=view&listid=6264) ...
And the author gives links to some examples of these oddly things:
5-sided: http://shop.rpg.net/product_info.php?products_id=35686
7-sided: http://shop.rpg.net/product_info.php?products_id=35373
Not exactly sure how that 7-sider is supposed to work, but hey ... ;-)
-Bryk
I like using different sided dice to solve combats, giving higher dice to better warriors and vice versa.
I think it's pretty elegant (and very funny when, for example, a 4-sided die warrior beats a 20-sided die one in a roll)
So, those 5 and 7-sided (and 16, 30, etc) dice could be interesting to get more variety in quality of warriors.
Greetings,
Roberto