This ghost motif has been used in the pattern:
Marley Earflap Hat with Ghosts for Halloween

Free for Samhain 2014 this e-book contains the following

10 Skull Charts
3 Colour Green Skull
3 Colour Toxic Skull
2 Colour Magenta Skull
2 Colour Greyscale Skull
3 Colour Strong Contrast Purple/Black Skull
3 Colour Warm Colours Skull
3 Colour Cool Colours Skull
3 Colour Pastels Skull
3 Colour Earthy Skull
3 Colour Fruity Skull

3 Ghost Charts
Large Ghost
Small Ghost
Ghost Border