Acquired Brodart Colored Blank Punched Catalog Cards (shopbrodart.com)
Medium-weight colored blank punched catalog cards
blue, green, buff, ivory, white, salmon
Stocking stuffers anyone? Santa brought 6,000 index cards down the proverbial chimney today. Should have enough now to index all the books in the house? 

A library card catalog with a red Christmas stocking hanging on it with a box full of index cards next to it.

Four drawers of a library card catalog full of index cards in blue, green, buff, and ivory.

Five card catalog drawers lined up and full of ivory, buff, green, blue, and salmon index cards

A library card catalog covered in stacks of Brodart index cards.

Surfing around with respect to library card catalogs, I ran across John Blyberg‘s Library Card Generator this afternoon. Anyone who’s playing at the intersection of analog and digital zettelkasten is sure to love the possibilities here.

Yellowed library card catalog card with top red horizontal line and two vertical lines that split the card into three colums. Printed on the card are a red 9/8j on the left with the contents of Niklas Luhmann's jokerzettel card typed out. There are a few scribbles handwritten onto the card as well.

Incidentally, if you’re still into the old-school library card catalog cards, Demco still sells the red ruled cards!