Disposing of rotary cutter blades
You experienced quilters have probably solved this problem long ago, but here is my solution.
Every time I threw away a rotary cutter blade, I would wrap it carefully in paper toweling so my husband or I wouldn't cut ourselves while emptying the trash. Then I found the perfect solution - an empty Ice Breakers mint or candy container. It's the perfect size and the top flips open for easy access. When it's full, I just toss it in the trash. You can buy one in the gum, candy and breath mint section. It would be great for sewing machine needles too.