Jamboard is a great tool for the classroom - especially now that you can customize the background!
This listing comes with 30 backgrounds that make a great informal assessment, exit tickets, lesson starters, collaborative activities and so much more . They are also a great way to get total participation and increase engagement. I've also included tons of ideas on how to use them with your students.
 
These are non-content specific and work for all ages and subject areas.  These are google slides for you to edit and download to use as jamboard background images (video directions included)
Get your Jam on!
 
Happy teaching!