Perfect Fit blinds are a relatively new type of blind on the market. They are a bit more expensive, but they look stunning and can be fitted to just about any modern plastic double glazed windows.
They don't need any fixing screws as the clips that hold them go between the glass and the rubber around the window. And when removed show no signs that blinds were ever on the window.
They are Avaliable in Wooden Venetian , Metal Venetian, Roller, and Pleated fabrics. Which are fitted within an aluminium frame Whic is avaliable in White and various shades of wood effect browns and Gray Which fit to the window with spring metal clips.