Here's my attempt to make cheesecloth look somewhat like burlap.  I'm not sure its entirely successful (I'm not sure the color is quite right--perhaps a bit of black to grey it down a bit), what do you think?

I guess a link would help:

http://cakecentral.com/g/i/3061878/a-birthday-cake-for-both-my-brothers-whose-birthdays-are-both-in-july-one-layer-of-red-velvet-one-layer-of-vanilla-nutella-filling-white-chocolate-whipped-frosting-the-bow-is-my-attempt-to-make-cheesecloth-look-like-burlap-what-do-you-think/