A wide game where teams hunt the playing area for bits of their teams coloured ribbon
Pieces of wool or ribbon, different colours for each team
Have a different colour wool or ribbon for each team. Hide them in the playing area, tie them to trees, fences etc. Teams have to find as many pieces they can of their colour in the time limit. You could tell them how many pieces they need to find. The first team to find them all wins, or the team with the most wins.