Cutting mats that are aged-out become bench toppers for my husband's shop benches. They can get glue or paint on them there, but they have extended their useful life.
Depending on the price of the scissors, if they still cut and are a decent brand, just have a nick, they might become "paper scissors" or "garage scissors". If they are dull and can't be sharpened for some reason, they are trash.
I haven't yet has a ruler with a bad edge, but if when I do it will probably become a "convenience" ruler for things like trimming area rug pads, etc.