This is a simple thing. Tape a postcard or series of postcards to a board, wet them all over and then splash in some complimentary colors. Let dry thoroughly and then follow the color borders with a black pen. It allows me to get the know the various materials I own but not use much, how the pigments works on a specific type of paper without the fear of ruining a pen drawing I spend hours on. An added bonus is that all the doodling is meditative and rests my brain.
And in the end, I have nice looking postcards that I can send to internet friends!