Stained glass set in double glazing

My next project is to design and build a stained glass panel to fit into an already double glazed window. The client lives in a lovely old Victorian house in Trowbridge which lost its original windows a while back to plain UPVC double glazing. They have recently invested a lot in a new bathroom and would love a leaded window to set it off.

The bathroom is white and light grey with various shades of blue and light green accessories and these are the colours they would like in the window. The window is North facing and overlooks a good size garden set mainly to lawn and shrubs; this gives the light reaching the window a green tint. To complicate matters, immediately below is a red tiled roof, which as you can guess, ads a red tinge to the lower part. The clients favourite artist is Piet Mondrian and they would like the window to reflect his unique style of painting.

Came back later with some glass samples and a couple of sketches, the client is happy. The window will consist of two panels, one above the other, with vertical columns of varying widths made up of the chosen colours. These will then be overlaid with random size geometric shapes in contrasting colours, evoking the spirit of Mondrian and his style. The trick in the design here is to get the balance of light to dark right for the orientation of the window. They will then be fitted on the inside of the existing glazing; I have a neat way of doing this which makes it look original.