My mum lives in assisted living and I thought last night, "What we need is some kind of automated mini market, a bit like a vending machine but slightly bigger and stocking more practical things. Then on days when she's not so good or the weather is awful she could just toddle downstairs for milk, teabags, toiletries..."
Of course it's already been thought of.
You can't copyright recipes either so my pink (completely natural) Barbie coleslaw will never bring me any cash. Quite disgusted really. Have you ever invented anything?