These origami stars have a three-dimensional look to them.
You can hang these up as decorations, especially at Christmas time, or as nursery decor.

Skill level
This is a front post stitch pattern. I marked it for Intermediate - experienced crocheters, mainly because it requires lots of focus due to frequent changes in instructions.

Materials
You can use any kind of yarn with a matching hook. The origami star looks its best when hook size is as small as possible, and the yarn is not soft and can be shaped.
You will also need some leftover yarn as filling.

Size
Using the materials I recommend above, the final diameter of the ornament would be approx. 7.5 cm/ 2.95’’