Aside from being golden or silver (1s, 2nd), league trophies have a coloured touch to them.
League I trophies are red, league II's are blue, league III's are green and league IV's are purple.
MVP trophies, however, are all purple.
I'm saying make them the same colours as the leagues they were won in, or make it a different colour altogether.
Look at this team as an example:
(89904)"Air is beautiful, yet you cannot see it. It's soft, yet you cannot touch it. Air is a little like my brain." - Jean-Claude Van Damme