We only had a partial one here and lacking any really high ND filters, I just made a simple pinhole camera to show the eclipse to the kids. I punched a approximately 1 mm hole in a metal cap of something and used that to project an image from the sun. Worked great as you can see below. Nice low-tech solution and to complete the low-techness I photographed it using my cellphone. Due to the way a pinhole camera works, the image is upside down (and mirrored but that is not that important here). We also did not have a full eclipse in the Denver area. The light was very interesting for a short while though with the sun mostly covered.