Paint a wall…
— DoInk Tweets (@DoInkTweets) July 27, 2015
— BrookeCentral (@BrookeCentral) January 5, 2016
Foldable, cardboard presentation boards, available through art and stationary stores are a cheap and portable option for desk-top work.
Grab a plastic table cover from a party supply shop and you’ve got a great ground sheet.
The cheapest and easiest solution for your classroom may just be a humble piece of coloured paper.