Ключевые слова: activity, american, art, background, ball, college, color, colorful, competition, contour, design, equipment, field, flat, football, fun, game, goal, graphic, green, icon, illustration, isolated, lace, league, leisure, line, linear, lineart, object, outline, oval, pattern, pigskin, play, professional, recreation, rugby, seamless, sign, single, skin, sport, symbol, team, touchdown,