Time for a vocabulary based powerpoint game for the whole class. With each click of the spacebar/mouse/screen a new letter will appear. All the students have to do is name and write down something they might find in a garden (or outside). Each answer is worth one point, so the team with the most answers has the most points and wins. For slightly older/more advanced groups you could also tell them that each answer that no other team gets is worth one point (for being an answer) plus 4 points (for being unique). A great warmer for most classes!