Students can easily participate in the same #buildcharacter social media activity as a good intro to the school year activity.
First, a class could agree on 4-5 character strengths to work on throughout the year. Then (to take the activity offline), students could bring in images to put up on the wall and leave there all year. It'd be nice to see who students admire for their grit, or what students think zest looks like.
This could also be done online without having to use student social media accounts: students could submit images to Google Classroom, Padlet or a classroom Flickr account (you can create an email address to easily submit photos), and from there it'd be easy to make a collage of images to use as a desktop background image whenever a screen is projected. To introduce students to digital tools, a teacher could do a mini-lesson on adding text using anything from Picfont (a web-based editor that requires no download), an app like Adobe Spark, or even a program like Photoshop.