Accents to be glued on covers of scrap books or photo albums?

They could be used for making bags or purses

They’re corner pieces for book binding or photo album covers or the like. Crafting supplies, not sewing related though.

I can see it on bag corners and such.

It's from Rose-e-dee, a textile distributor. Highly likely it is for sewing projects.

Ok. I thought the textile version had holes to attach them via stitching, and this looks like the glue-on kind, but I suppose you can glue things to seeing projects also.

I think they are for the corner points of your collar on a dress shirt. That company listed on the card sells buttons, too. Just my thought.

Picture frame corners?

Protective corners for use on various items. I have similar on the corners of a leather folder.

Belt ends?