For littlies:
Save all my plastic bottle tops and hide them in a box for them to 'find' then provide pots, pans and utensils.
Treasure baskets with natural things such as loofa, pummice stone, beaded necklaces, wool, silk, shells, dryer ball, velcro.
Two massive bits of MDF outside covered in paper, provide paint.
Tuff-spot tray full of flour/oats/glitter along with plastic toys, bowls, spoons.
Shallow-ish tray full of warm water and bubbles, bottles, pots.
Coloured pasta spirals with pots
Finger painting
Small world play, prams, dolls
Musical instruments