Earlier in the year, I made leather paper from Julia Andrus's book "Paper Transformed". That technique uses Perfect Ink Refresher to soften the card stock. Rena mentioned that she was able to achieve the same results using glycerin (which is cheaper and easier to find in most pharmacies) instead of the Perfect Ink Refresher. I had to give it a try.
Rub glycerin into both sides of brown card stock with a paper towel.
While the card stock is still wet, wrinkle it, being careful not to tear it, until it has lots of creases in it.
If desired, rub darker brown ink over the creases to highlight them.