Dyeing

 Just like you can color your own yarn (thank you, Kool-Aid), you can stain your own craft paper.  You are "supposed" to use either coffee or black tea.  I don't drink either, so improvisation it was.

Sadly, Black Cherry Berry produces only a slightly dark, and not "aged" hue, so I thought

 Turned out to be a good call.

Yes, it meant sacrificing DP, but you're supposed to suffer for your art.