Paint a wall…

RT @cyberteacher: Green Screen & Ideation walls in the new STEAM Room at @EducPlus are painted! #MOedchat #innovation pic.twitter.com/6K5z7XklCL

— DoInk Tweets (@DoInkTweets) July 27, 2015

A fresh coat of paint over the holidays creates a wealth of possibilities! #greenscreen #lkdsb #learningcommons pic.twitter.com/7HMGDrAtxS

— 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.