It's very easy to make and the result is really, really nice!
PS: this is my first "step-by-step" and as you can probably notice, English is not my first language, so I hope this is clear enough. If there is anything you want to tell me please leave me a comment, I appreciate knowing what you think very much!
Do the same for all 12 strips.
Glue them together to keep them still.
At first they will often move so you just need a little patience :)
Do the same for all four sides.
Ok, the first side of the star is done!
Now take the 6 strips left and do the same thing you have just done to create another "half star".
Insert the remaining strips in the other "half star" and glue the tips with the ones you glued together previously.
All this is harder to explain than to do so please take a look at the pictures, I hope it's easier to understand this way!
And voilà, the star is finished!