Solar lights using an antique glass insulator, a recycled electrical conduit, and recycled machine shop drop. Or the leftovers for these I use what is left after they stamp out golf divot tools. The pieces are welded into a leave that is then welded onto the conduit. Rebar is added to the bottom and a treated rod to the top. I drill out the insulator using a drill press, and a diamond tipped a bit. The insulators I use fit the solar light top you can get at Wal-Mart.
For more solar light idea, you can check this article: Solar Soda Lights.