ANY Doily design could be converted to this rug style; oval, round, square etc. Do it without a hook, just use your hands if you know how to crotch. As for heavy; just use the size cotton rope you want, doesn't have to be this heavy.
I've seen versions of these now a few times and I really do love the look, and though this particular image doesn't link to a pattern, they seem pretty basic to figure out. Hmm, I can think of a few people that would like one for Christmas :)
This is fun crochet! Lace tutorial!! sooo pretty! here is the Original link to it http://domihobby.ru/343-vytyanutye-petli-s-obvyazkoy-petli-brumstik.html you will have to translate the tutorial on it because it's in Russian !!