Take a walk around your school or your neighborhood. Sketch or take pictures of all the different kinds of triangles you see. Keep track of how many of each kind you find. Trade pictures with a partner and challenge one another to identify the triangles in each collection.
Create a triangle bingo game. In addition to the triangle types, use different triangle colors to give you more matching options. For instance, have spaces and calling cards for blue isosceles, red scalene and green equilateral triangles. The first person to get five across, down, diagonal or blackout, wins.
Pass out geoboards and rubber bands. Read a triangle riddle such as, "I have three 60 degree angles. What is my name?" The student must make the correct triangle on his geoboard, hold it up and call out the correct name.
Challenge students to create a drawing, painting or mosaic using only triangles. Set criteria that requires them to use at least one triangle of each type, and watch the creativity flow.
For technology-oriented students, online games are a way to connect with what makes their brains tick and help them master necessary math skills. Quia offers several matching games, and Pearson Education's Baseball Geometry has a section on classifying triangles to entertain while learning sneaks in under the radar.