I personally played mainly during the Onslaught block (Judgement came out around the time I started, and I quit during Mirrodin due to ravager affinity, then came back briefly during Kamigawa).
Of course, few of the decks I saw back then made it into the lower formats, and the few that did were heavily altered due to the extra cards allowed in the lower formats. There was a lot of decks back then that I thought were rather unique. Nightmare reanimator, rift slide, mirari's wake, madness, all the tribal decks (even if most of them sucked).
Of course, nobody remembers these besides those who played during Onslaught. It seems that only the stupid op decks that broke the format get remembered. Everyone knows about Tolarian Academy, Ravager Affinity, Psychatog, you get the idea.
That got me thinking, what about the decks you saw during other versions of standard/type 2? Besides psychatog and some green-red rush deck using Fires of Yavimaya, I don't know of any decks made possible by invasion. I don't know what decks Mercadian Masques gave. What decks were popular during Invasion-Odyssey (beyond the reanimator and madness decks I mentioned). I've also heard of Sliver decks from around Tempest, but I've never seen an actual Sliver deck from the time, nor do I have any idea how they actually performed in the format as it existed back then.
Is there anyone who has ever tried to compile a list of all the versions of standard that have ever existed? I hate games that are forever evolving. If you find a deck you enjoy, chances are you'll never be able to play it again once the cards it needs rotates out. And even type 1 (or vintage I think its called now) is constantly in flux due to the ever increasing power of newer cards.
As for why I want to know this? I was thinking of using pygame to make my own card game that allows you to play with decks that work like the ones I liked (though not with the exact same cards, and not all of the decks would even be based on MTG decks). I know of the decks that were fun in my time, but are there any other interesting decks that have existed in standard either before or after I played?