It's UHT drinking yoghurt and all the milk here is UHT as well, so i can't use it to seed more

But...I really don't like drinking yoghurt. It's more like a fermented milk type taste than a creamy yoghurt taste.
I've used 2/3l to make muffins, but now have no more space in my freezer to keep more muffins.
So: 101 uses for drinking yoghurt please!