I’m not sure how small and thin these are, but we have been using somewhat similar packaging for starting our seeds for our garden.

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If in doubt give them to your nearest Primary school. They will find a use for them. Cut up into small windmilss or flowers for a class display.

I use them when my kids are painting - it keeps the paints separate which keeps the kids happy and I don’t feel bad throwing them away if they won’t easily get clean.

Depending on how strong they are they can be used to safely pack away fragile Christmas tree ornaments. I reuse the plastic boxes and insides from cheese biscuits in this way.

You could perhaps make king-size ice cubes with them, or small lollies perhaps?

You could melt down some chocolate and use the packaging as molds and pour the chocolate in… Posh homemade chocolates…

great for decanting single serves of cold rice pudding, custard, meats, etc etc into the freezer. Then you can take out just one portion at a time when you actually need it.

Making pizza
These are ideal size for freezing pizza portion toppings in. Any left over food, chicken bits, mushrooms, onions, sweetcorn you name it, it can go on a pizza. Bought pizza has always been a cause for an argument in our house, one person doesn’t like onion, and another hates mushrooms and so on. I tend to make quick pizza bases using pastry; I can’t be bothered nor have the time for a bread mix. Now everyone is happy, as they put there own topping on!