have all their posters for stores (and other places who sells their ice cream) from 1967 - 2007 up on their website.
It's all in Swedish, but still there's pictures and you can compare how much the poster changed durring those 30 years.
From 1967
More here
(just click one of those pictures for each decade and then the year on the bottom of the page.
and then the posters are clickable for a larger image)
