The black plaid and the black/yellow/orange pattern look 70s to me (the plaid looks really, really 70s to me). The top plaid looks early 60s to me. The other two in the top row look older. The last one with the pink/blue/green looks more recent, but doesn't evoke a specific decade in my brain - 70s or 80s?
Sorry, this isn't probably helpful for your purposes, but it's fun to guess.