I recenlty received an email from Alex telling me about their hand-drawn wallpaper designs. Handmade Wallpaper is a Canad based company that is inspired by classical printmaking techniques such as woodcutting and lithography.
Simplicity in color and fine contrasted parallel lines and high level of detail are their primary goals. Their main inspirations are the printmaker M.C. Escher, as well as Islamic patterns and the underlying science on how elements are ordered on a microscopic level. You can see their entire collection here.