Lidl have some 2m x 1m artifical grass mats in stock for £5.99. They are more of a crushed felt look than the 'normal' standing grass tufts ones and also have a rubberised backing to help stop them sliding around. Well worth checking out as they look good for 10mm miniatures. I'm going to get one so I can use it for grid based games such a To the Strongest etc.