Here's a brief tutorial:
We need 12 strips of paper. I cut them out from some square papers. The ratio is 1:16.
Pre-fold them as the second picture into several isosceles right triangles.
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Use five strips to construct a star. Then wrap around them with the 6th strip.
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One by one, add the 7th～11th strip to the origami. At this stage, the first five strips should meet their edges respectively. The edges can be hidden easily since the paper strips are overlapping each other.
Finally, add the last strip, hide the edges and we're done!
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These are always fun to make.
Yeah, it's a good way to kill time too.