Custom, color coordinated mattes

Sometimes I find mattes at garage sales and can't resist buying them because mattes in the store are kind of pricey.  Usually I find dark green or some other color that I don't have anywhere in my house.  For my daughter's room, which is light green and pink, I purchased scrapbook paper and Mod Podged it onto the ugly colored mattes, tying in her colors.  (There aren't before pics - I did this ages ago before I was concerned about that - and they're a little blurry.)