I filled the backs of envelopes with black lines but nothing surfaced .
my doodles ended up needing to be quilted and after starting out with a piece o plain muslin, the black thread I used kept breaking . I switched over to a variegated blue called de Nile by Superior of the king tut line that I got a cone of because I like it so much, then the quilting /doodling went much smoother. free motion quilting is so like the doodle marks we made in margins of our note books as students in class or on the phone with a pen or pencil. The this case the fabric is the paper and the needle is the pen only reversed because the thread is stationary and I move the blank fabric beneath the needle. the foot peddle got hot . I quilt barefooted.
that is not a problem with a hot iron on hand. I fused some of the art paper made from those painted coffee filters, again, on the backs and placed a weight on finished cards to flatten them for the mail, overnight.