Easiest way I know of is with Pandoras Box. Go into Deco and select the ground tile you want, then to the right you'll see a button called Tile. Click on that and then target the ground near you and then again in the opposite corner for the other side of the field. ie:
A ------------ 2
1 ------------ B
Target in area 1 and then again in area 2. This will fill it all in between the 1,2 A & B. You can make it pretty much any size you want. Beware when trying to do this in Malas tho. Its at a different level, just cant remember which # it is and the tiles will appear in mid air. I think its @ -20, but not sure. The # of course being the small window to the right of the Tile button. And as long as you have the tiles you're adding set to static, they'll stay forever.
