Small pieces of cardboard can be used to paint on and I rescue them whenever I can. I've primed these with a thin coat of glue (white glue mixed 1:1 with water) and now they can be used for any medium including oils since the priming seals the surface and prevents paint from being absorbed into the cardboard. The glue looks whitish and semi-opaque when wet but is transparent when dry. The one on the left is bowing with the wet glue but the card is thin and pliable and can be mounted on something else if the work is worth keeping. If preferred the priming can be done with acrylic gesso instead which gives an opaque white ground.
I like having a few of these around ready-primed. Being cheap, not to mention virtually free, one doesn't feel inhibited or afraid of wasting materials when using them. These are ordinary grey cardboard. The brown corrugated cardboard can be used too but it isn't quite as good.
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