This is my larger tear drop stake which has served me so well over the years.  It was originally on the bow of a motor launch and was used to tie a line around.  I filled this  hollow steel form with lead then mounted it on a threaded stem. As I have mentioned before, this particular shape has an infinite number of curves within itself.  You simply swing your workpiece around until you find the right curvature to hammer over.  I like to think of it as a dimensional french curve.  It's not a do all kind of stake but it has a function that none of the others can fulfill. I'm always on the lookout for odd shaped pieces of metal that can be pressed into service as a potential forming stake. There's no reason to feel bound by regulation stakes, you  can hammer sheetmetal over almost anything.  For  lighter  guage metal, wooden forms carved out of maple or oak can be very servicable as well.  Try to design the wood forms so you'll be using the end grain to hammer over.