The Grass Paintings is a series of large-scale single canvases and diptychs. They feature a recurring motif of green backgrounds executed in broad brushstrokes and overlaid with marks in shades of blue and pink. In Lancashire and Thailand, Betrothed, Brian Clarke integrated this motif with window silhouettes on black ground. The series was created during the artist’s stay in Thailand.

In 2002, Tony Shafrazi Gallery wrote in the publication Brian Clarke: Transillumination on Brian Clarke's 'Grass Paintings' series:

'The dot-like effect of the paint upon the canvas texture, and the Cezanne-esque palette of these examples may also be noted. The "petals" - again, events in a field - are depicted as through lit by a shaft of sunlight that has penetrated the gloom of dense woodland. Clarke was inspired by Martin Heidegger's observations of the weg and the lichtung, of the symbolism of the pool of light in a forest pointing the way out of a morass of philosophical complexity.'