Cut out and bake round sugar cookies according to the instructions in my Vanilla Orange Sugar Cookies recipe.
Prepare one batch of my Royal Icing Recipe for Cookie Decorating.
Place one cup of icing into each of two small bowls. Tint one yellow and leave the other one white. Using lemon juice, thin the icings only slightly to piping consistency, so that they are less stiff but still not runny and will hold their shape when piped. Transfer the yellow icing to a piping bag fitted with a coupler and a #3 round tip. Transfer the white icing to a piping bag fitted with a couple and a #2 round tip.
Divide the remaining icing into two bowls. Color one green and leave the other one white. Using lemon juice, thin the icings to "two step" consistency (see post for Royal Icing for Cookie Decorating) and carefully transfer each color to a squeeze bottle. Top each bottle with a coupler. Place a #3 round tip on top of each bottle.
Using the white icing in the squeeze bottle, pipe and fill half of one of the round cookies, creating a semicircle shape. While icing is still wet, sprinkle the top with the rainbow colored non-pareils, filling the white surface completely and gently shaking off extras. Repeat with remaining cookies.
Using green icing, pipe and fill the remaining semicircular area of each cookie. Allow the icings to set for at least one hour.
Using the white icing in the piping bag, pipe 5 evenly spaced field lines, with the center line perpendicular to the yellow line and the four side lines slightly slanted, as in the photo.
Pipe a "5" and a "0" on either side of the center line to represent the 50 yard line.
Using yellow icing, pipe a line down the center of each cookie, diving the rainbow colored "crowd" from the green "field." Allow cookies to dry at least 5 hours or overnight.