Check out the BBC Good food links below for inspiration
Healthy sandwiches:
https://www.bbcgoodfood.com/recipes/collection/healthy-sandwich
Sandwiches for kids:
https://www.bbcgoodfood.com/howto/guide/sandwich-fillings-kids
Indulgent sandwiches:
https://www.bbcgoodfood.com/recipes/collection/sandwich