I want to get the effect of the black swirls coming off of the cake pictured for an upcoming wedding cake order that I have. What can I use to get this effect? Thank you for your help!!

this is a dried grass you can buy at michael's or hobby lobby -- i don't know the name of it -- it's like curling ribbon and you can get it to scroll around like that

It's often called bear grass. https://www.google.com/search?hl=en&site=imghp&tbm=isch&source=hp&biw=1631&bih=922&q=bear+grass&oq=bear+grass&gs_l=img.3..0l10.1833.3730.0.3857.10.8.0.2.2.0.228.1397.0j6j2.8.0....0...1ac.1.53.img..0.10.1399.T6BVk-AX0uc