@CiaraNi can't find a picture of the funky duvet cover ones..but these were our first wonderbag attempts made out of an old patchwork table cloth, the other was made from some pieced together scraps from colourful shirts. More on wonderbags here https://wonderbag.co.uk/

@CiaraNi I run a community project and we occasionally acquire free big curtains or super king size duvet covers from the charity shop who can't always sell them..we make things from them.. lampshades, bags and more recently been making wonder bags which are kind of haybox cooker type things..cook food up a bit, pop in wonderbag and keeps hot for up to 8 hours so cooks with very little energy input.