Someone suggested you search Interweave's web site as well as others. I would suggest you check out weavingtoday.com an offshoot of Interweave. Their "Free Resources" are really good. You do have to register to download the free ebooks but it is free and you can easily opt out of their emails.
It will give you a good starting point for yarns and patterns for placemats and towels. There is a set of "elegant" huck lace placemats in natural 3/2 cotton. I have done similar huck and huck lace placemats and runners with finer cottons and have really liked how they turned out.
PS: while you are there, make sure to download the "Master Yarn Chart". It is well worth the price of admission. :)