There's another, very different method...
It's called optical projection, and compared to the pinhole projection method, it actually provides bigger, brighter, and sharper images, according to the AAS. Unlike the pinhole method, it involves making modifications to a telescope, pair of binoculars, or other lens-based viewing system ( as in "optics," yo). We should make it clear that this is really for experienced astronomical observers, because even with modifications, there's a danger that you might damage your device if you aim it at sunlight this bright, or worse, your eyeballs. If you know what you're doing, go to the AAS for more information.
Or try Neil deGrasse Tyson's hack
Now, if you don't have access to a cereal box or a pizza box, you can still pull off a version of this trick. The pinhole projection method just amounts to tiny holes projecting the image of the eclipse onto larger surfaces. To that point, one method the American Astronomical Society offered is taking your hands and, again, with your back to the sun, holding them up in a lattice-like, fingers-criss-crossed pattern over a patch of sidewalk. You'll be able to see the eclipse shine through on the shadows projected onto the sidewalk. You can get the same effect from standing under the leaves of a tree, too. The principles behind the method all hold.