I love a lap desk! I bet you do too.
Here are some links for DIY lap desks –
http://www.abeautifulmess.com/2015/02/diy-lap-desks-no-sewing-required.html
http://www.instructables.com/id/DIY-basic-lapdesk/
http://www.brassyapple.com/2011/08/lap-desk-tutorial-pleased-as-punch.html
You can make this a back to homeschool project!
Fun – and fun learning is forever learning!