In the fabric covers, you have the option of Linen Blue, Linen Brown, Suite Gray, and Suite Blue. They all cost $20 each, which is a pretty good deal.
They also offer these covers in leather. The FxCel Black and FxCel Brown covers are only $25, which is also a great price.
The covers feature pockets in the front and back with which to hold the notebook covers. I'm using mine with only one notebook, and it's pretty snug and secure. Although, you can fit two notebooks into one cover. This presents a nice option if you'd like to carry more than one notebook in a convenient cover.
The size of the cover is large enough to protect the notebooks, and it seems to be made pretty well. I can't see any wear so far, but I'm sure the fabric will fade a bit as it is used more. The tan stitching around the edges is a nice touch to the overall aesthetic. If you purchase a notebook cover, it comes stocked with one ruled notebook.
Overall, I've been enjoying the Franklin Christoph cover as a compliment to the notebook. It adds a degree of protection and also convenience if you want to easily carry two notebooks as one. The fabric is a nice departure from the standard leather fare, but you also have a couple of leather options if that's your preference. Again, check them out next time you're at a pen show, or throw one into your cart with your next order!
(Franklin-Christoph provided this product at no charge to The Pen Addict for review purposes.)