Hi, how about 'friends as a display focus - include a range of hair, skin colourings, mobility aids and sensory aids - glasses/hearing aids.
All kinds of people is a nice read - from amazon.
People are discriminated against for their living arrangements. Maybe a display for 'Homes' would be good? Igloo, hut, houseboat, caravan, trailer, brick house, tent, flat, bungalow.
Nationalities spark discrimination - maybe a display that looks at 'Around the world and languages. and also ability, which could be used as a title to look at how it's fun being different' - likes, dislikes, height, preferences, skills .. eg: xx makes beautiful paper designs, xx climbs up and down the outside slide with great confidence, xx likes cutting paper and xx enjoys digging in sand and soil ..
Diets, lifestyles, culture: vegetarianism, vegans, allergy sufferers, travellers, relationships.
Helping out - could show how we all have the potential to assist others. Ask for help ourselves and offer it to others.
Best wishes
xx