Hi, they sound good and T's right you can introduce culture with any of those themes by exploring what your children are familiar with and what's available in other countries.
Pebbles from an English beach, pebbles from Spain could enable you to provide spanish words, & english words, spanish dress/hat/jewellery and english counterparts. Have a bowl of water to explore how pebbles can change/darken their colour, add scent to it or herbs to float and crush ..
Hth xx
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