I knitted a hat for my great-nephew... My niece wanted day of the dead theme, so I searched and found a pattern here: Blanca Crochet Day Of The Dead Applique Skull Pattern by Spider Mambo.  I did a straight stockinette stitch for the hat and made it long enough to tie the top into a knot.  I did it flat at first, but frogged all of it and started again because I couldn't get the seam right... :-/