My favorite way to eliminate the often paralyzing fear of "ruining" "good" paper is to just paint on any and all junk mail that comes into my house. Higher end catalogs are great for this, they don't use slick, thin paper (and even that gets used in collage or as a desk cover for other projects) and they're already bound for you. Just add marks! Carry it with you. Scan the pages you like. Cut it up later for making other art. It's "just" junk mail, so there is literally no pressure. I have HUNDREDS of these type of things and I run across them all the time, forgotten, in some old backpack or purse or drawer and it's a treasure to look through them again, and add new marks, paints and words.
Every once in awhile, this poem floats to the top of my head and I taste plums.
This Is Just To Say
William Carlos Williams - 1883-1963
I have eaten
the plums
that were in
the icebox
and which
you were probably
saving
for breakfast
Forgive me
they were delicious
so sweet
and so cold
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