we make picture frames all the time and its not every picture that is enhanced by the judicious use of a mountslip but when they are appropiate they do add to artwork or indeed photographs within a frame. In B&W photos they are especially effective over either a silk black or a bright white mount. Also we like to use the line known as a v=groove. This is always a nice visual counterpoint to the slip. The Quality Framing Company have a comprehensive range of mounts and slips to suit all kinds of artwork and photos.