Hall Pass - Print on card stock and put into ID badge holders on coil key chains (both from Walmart). Blank pass at end can be written on with a whiteboard marker and then erased (for students who have to go somewhere else in the building). These are waterproof (seal the top opening with packing tape or buy self-seal ID badge holders) and kids wear them high up on their arms so they don't get wet/dirty in the bathroom.
Pencil fidgets - They allow the student to have something to move around in their hands. Students that require such fidgets have a need for sensory stimulation, and fidgets provide that within the classroom setting. I know about 50 kids... and myself who would benefit from these.
Classroom idea: Kids take one of these and put it on their desk when they go to the restroom. When they come back, they take a squirt of hand sanitizer from the bottle, and then put it back for the next kiddo. (Source: http://www.3rdgradethoughts.com/2012/04/better-bathroom-pass.html#.UR6tJnLep8E)