I am a color person so I love the bright neon colors for keeping organized during any type of project because I can color-code my notes on the cards with folders sticky notes or any other colorful item I am using for my project. These cards are great if you are using a file box for long-term use of the cards because you don't need divider cards. Just use a different color for each section. It makes it much easier to remove and file back after use. One suggestion is in a recipe box instead of using traditional recipe cards. I make great use of these cards when doing any major shopping. I can use a different color for each person room in our home event etc.
Well in the old days index cards were actually that...index cards. Now unfortunately they have thinned out the card stock to practically a paper stock. So they shouldn't be called "cards" anymore. Index paper is more like it.