Don't know what to do with those extra cardboard boxes around the house? Upcycle them into a spiraling star.
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Using a crafts knife and a ruler, cut out 21 rectangles from cardboard: seven measuring 2 inches high by 2-1/4 inches long, seven 3-1/2 inches high by 2-1/4 inches long, and seven 5 inches high by 2-1/4 inches long.
Divide each rectangle into two triangles by cutting corner to corner. This will produce 42 triangles.
Make sure your knife has a sharp blade -- a dull blade might not cut through the cardboard.
Separate the same-size triangles into groups (you'll have three sets of 14). Apply a little glue at the right-angle corner of a large triangle. Aligning the right angles, place one of the mid-size triangles on top of the large triangle. Then, apply glue to the mid-size triangle, and place one of the small triangles on top of it -- again, lining up the right angles. Repeat with the other triangles until you have 14 sets with three layers. Let dry.
On a stacked-triangle set, make a light pencil line on the small triangle 3/8 inch in from the longest edge. Using a hot glue gun, apply a drop of glue to the area between the pencil line and right-angle corner and align the long edge of another set of triangles with this reference line. (Refer to the photo below for the correct placement.) Repeat with the remaining stacks until you have a spiral. Let dry and hang with string and a hook.