For a while in the 70's it appeared as if they came up with a new one each year - here's 1975:
From 1980 to 1986 they all looked the same, except for updating the year, of course. Here's 1982 when the Cardinals beat the Brewers:
From '87 to '99 the logos were based on the ball diamond motif, with script 'World Series' - beginning in '92, a globe was added, emphasizing the 'World' aspect, I guess. I think '89 is most interesting of this group:
From 2000 to '07, the globe was the dominant feature and the details were more modern and sort of 'Worlds Fairsy', if that's clear. The best one of the bunch is, obviously, '06 when the Cardinals beat the Tigers:
This year they've returned to the ball diamond image and used colors suggesting fall and I think it is the best of the bunch. It and the League Championship logos are similar and one or more of them may wind up in the Logo Farm on the right:
If you'd like to see them all from 1974 to this year, you can right here.