Ohhhh!! I just found this lovely (or creepy, whichever you prefer) shawl on Red Pepper Quilts.
Don't you just love it?! I could definitely see this as a bridesmaid gift to be worn during your Hallowedding. Apparently it knits quickly - I have not tried something quite this challenging, but I may just have to have a go at it! Pattern created by Kristen Kapur and the information is here.