Before class, prepare some photos of well-known admirable people. Some suggestions are Bill Gates, Mother Theresa, Nelson Mandela, J.K. Rowling, Einstein, Gandhi, Pele, and Martin Luther King, Jr. Again, it is best to customize based on your students' level and cultural background. You can find public domain photos at Wiki Commons.
In case your students are not familiar with the person, write their name and a short bio on the back of the photos. It shouldn't have a lot of information that students will have to take time to read, though. For example, Bill Gates might read: Founded the software company Microsoft. One of the richest men in the world. Started a foundation with his wife to reduce poverty and provide healthcare to the poor.
Split the class into pairs and give each pair two photos. First, ask the partners to tell each other what they know about each person. Then ask them to choose which person they admire more. The partners may have the same answer or different ones.
Ask the pairs to share their decisions with the class.