Look in newspapers, on TV, on bumper stickers, billboards, flyers, advertisements, the logos of your favorite clothing, the buildings around campus, and people sitting at cafes. What kinds of arguments do you see in these images? Find an implicit argument and write a 1.5 to 2 page paper explaining and analyzing it. Open your paper by clearly explaining what it is that you've found, where you found it, and why you think it possesses an implicit argument. Then spend the rest of your text analyzing how the argument works. Identify elements of ethos, pathos, and logos if they're apparent (they may not be) and be explicit about how the argument gets made. Details will be the key here. Identify them and explain how and why they mean what you say they do.
Read Tallon Harding's essay on how words and images work to make an argument.