NOVA has a fantastic feature about historic space suits by Susan K. Lewis, featuring space suits from Project Mercury, Gemini and Apollo as well as those that didn't make it out of the prototype/design stages. This one above is probably the best one of the bunch:
Perhaps the oddest-looking proposal for lunar exploration was the "gerbil-in-a-ball" approach. Engineers at Johns Hopkins University's Applied Resources Laboratory demonstrated their Spherical Experiment #1 (SX-1) before NASA personnel in late 1964. The large, transparent sphere was designed to give astronauts the ultimate in mobility as they rambled on the lunar surface. The prototype even featured a mini airlock for transporting samples in and out of the sphere.