These fir cones make nice Christmas tree decorations. Designed by myself, they are based on the pleated part of Super Pineapple Tessellation.
The smaller variant uses a 16×14 square grid. Since 16×16 is much more convenient to fold and uses a full square, two grid rows at extreme ends can either be hidden underneath or used to introduce a color-change as in the red-black one visible in the image. The elongated version, whose proportions resemble an actual fir tree cone better, is from 16×32 grid. Other grid sizes are possible as well, though the circumference should not be too large if the cone is not to have a hollow “core” in the middle.
A piece of string tied around a crumpled piece of paper squeezed into the central “tunnel” in the cone can be used as a hanger without the need to pierce the paper for attachment.