If you're using them straight away, go for it and then blame the weather for their mushiness.
If not using them straight away, put them in the freezer or in the bin. They will definitely go mushier when frozen, which they are already, though.
If you freeze them then use them, you can go the usual route - use them as unusual and flavoured ice cubes, put them in with your ice-cream or make mixed-fruit crumbles out of them (all the berries should be mushy after cooking anyway).
I love experimenting with fruit/spice combinations for meals, but strawberries are one of the rare things that seem ..... well, I hope you can experiment and find something they are mixable with. Pinapples and chillies, or cheese, or aubergines, or honey, or......., yeah - strawberries, noh!