Sure, I can do that. Silk sleeping bag liners are the nicesttheyre soft, compact, add a little warmth to a sleeping bag or bed, and can be used as a stand-alone sleep cover in very warm climates. They also wick moisture and dry quickly. A good example is the Cocoon Ripstop Silk Bag Liner/Travel Sheet, which sells for $65 (cocoon.at).
Cotton liners work pretty well for everyday use. Theyre not as warm or slinky-feeling as silk, and in damp climates theyre more apt to stay damp because cotton can absorb a lot of water. The upside is that cotton liners are easily washable, and theyre inexpensive. Cocoons cotton version of its silk bag liner goes for $20.
Wool is popping up everywhere, and you now can purchase a Merino wool bag liner from REI for $65 (rei.com). This might be a really good choicewool wicks moisture well, is very comfortable, breathes well, and its washable. Along with the silk liner, this would be one of the nicest ones to have.
There are, of course, several synthetics. Those such as CoolMax ($40 from Cocoon) would be comparable to silk in feel and utility. I like CoolMax a lot. Keltys fleece liners ($40; kelty.com) are the warmest of the bunch, adding 15 degrees or so to sleeping bag or bed warmth. Theyre also the bulkiest. But fleece does wash well and feels nice against the skin.
As I said, I like silk. Wool would be a very close second choice, especially if a little more warmth is desired. The rest all work well, but just arent quite as luxe.
Hope that helps!