Here is my isocahedron. It’s a 20 sided shape. It’s made out of recycled christmas cards and staples and I put it together in 20 minutes!
It’s a brilliant way to use up left over greetings cards, but you could use anything. You just need 20 circles of card the same size and a triangle of card where the corners touch the edges. Fold the sides of the circles up around the triange and then staple all the edges together.
You can also leave one end open and use it to put presents inside! Just thread a piece of wool or ribbon through the edges and tie it together in a bow.