This video walks you through the simple process of making tea-stained paper at home. You can just any kind of dark tea and light colored or white paper, copy paper works just fine.

Steep 5-6 tea bags in 500-600ml (2-2.5 cups) boiling water
Soak pages in tea for 5 minutes (drain off excess tea before leaving to soak)
Dry in 180-220 degree oven in small 3-5 page stacks

Check out the handmade journals I make with tea-stained paper in our Etsy shop at bit.ly/shopholistic