Fingerprint Door Lock - This advanced lock only opens the door when both fingerprint identification and a password are used according to the user’s settings, to enhance home security. The product also adopts state of the art Random Security Coding technology which generates two variable digits, and after pressing these two digits, a user can enter his/her own password and will not expose the password on the touch pad.
You could paint something on a canvas and everyone could contribute with their thumb print... You draw thr jellyfish top and everyone's thumbs the tentacles? Etc! I love this idea for the grade classrooms. Maybe a quote? More of a keepsake.