Shape {
    appearance Appearance {
        texture PixelTexture {
            # the following line defines        
            # a 1-pixel wide, 2-pixel 
            # high, 3-byte RGB image
            image 1 2 3
                # the following line 
                # specifies yellow for 
                # the left-most, 
                # bottom-most pixel
                0xFFFF00
                # the following line 
                # specifies red for
                # the right-most, 
                # top-most pixel
                0xFF0000
        }
        material Material {}
    }