Wow, I'm glad you guys quit it with the rainbow colours thing. I suspect that all of the ones with the same denomination but different colours are from different years, but I don't have a guide to check.
Finnish stamps are very hard to find, and I think they're always so old because they all date from back when there were still Finns settling around here.
(I also got a pack of Austrian stamps because the packages were 'buy one get one free' and they looked kinda nifty, what with the WW1-era 'Deutschösterreich' ones.)
Edit: I just made my scrapbook more awesome by mounting appropriate old stamps on some of the pages :)