Kenner produced a line for Superman called The Man of Steel.  The test show pictured below is supposedly an unproduced version of Superboy from that line.  I don't know much about it though, so if you have any info, let me know!

This next item is a sample of a nifty Superman lunchbox that was produced around the time of the Superman Returns film.  This is actually a sample, not a production box, and is labeled as such inside.  It includes the cool external cape.

What's better than a sample prototype lunchbox?  A sample prototype lunchbox that was never produced - that's the one in the next two photos.  Check out the cool kryptonite label inside!