Are you looking for an area rug? or wall to wall carpeting? Do you have an idea of what style you're looking for, patterned simple plush, etc?

Thanks for your reply. Looking for wall to wall carpet, no pattern, and we have a dog so very light colours are out!

Looks like that fabric has many colors you could pull in. If you're going for a warm tone- this could be a nice option: https://shawfloors.com/flooring/carpet/details/artist-view-iii-ea565/grey-flannel
There's also some grays in there. It has a nice tweed through it. Here's a personal favorite, that we install very frequently and has good color options. The colors online don't show well I would find a dealer that has the product and ask for consumer color swatches. http://www.dixie-home.com/web/forms/productdetail.aspx?sId=G5221&cId=22138

If you have a dog, go for a Nylon carpet- if you can find a solution dyed or "Stainmaster Pet Protect" nylon, that's the best option. Very durable and cleanable.

Thanks so much for your help and advice! Absolutely love the grey flannel x