No, not the kind you use junk mail and paper bits blended with water to make a pulp and press it into sheets of handmade papers. This is a trick Mary Green taught us that is a lot less messy and the possibilities are endless. You may remember seeing how I used these in the Mary's December challenge which I posted recently.
Here is one I made using a music sheet and a butterfly plate from an old encyclopedia:
And here is what I made using old book text and an end paper from a book:
I love the look of transparency this gives to the papers. Check out Mary's blog for a detailed look at how to do this on your own.