Are the pieces 100% cotton or combination of cotton and polyester? Are they machine washable or dry clean?
I ask because a neighbor gave me a bunch of books and most were dry clean or polyester/polyester combo.
I took what I could use, soaked in water and Dawn detergent to get the paper off, and after drying, ironed and put away for future use.
The poly stuff may hold up pretty well for keychains, bookmarks, and such.
Have fun.