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I am creating a tartan - but the online Tartan Designer shows the colours by different horizontal and vertical interwoven coloured "threads".
While the "shade" created by these lines is realistic, I want the "interwoven" colours to show as a "simple" "flat" shade.   

Is it possible to "blend" the "threaded" colours into a single colour shade? 
[attachment=11626]

Filters > Blur > Median blur with a radius of 1:


If you have the pixel-synchronized version (threads an exact number of pixels) you can also try Filters > Blur > Pixellize (with a 2x2 thread block).