I can answer to burlap having made some flowers with them lately. The Bigz dies work well. I saw a great hint to stiffen the burlap with glue first. If you stiffen the burlap your flowers look like this:
Burlap Vintage Flowers they will not fray and will hold their shape better. For a more "grungy" look try the burlap without stiffening first (this is actually a larger weave burlap to start with as it is from a coffee bean bag from my future sil's work place)
Queen suen CASE. Both cards have links to tutorials I found helpful.