As an undergraduate, I became fond of real analysis and complete metric spaces. Regarding completeness (mostly in R), I proved the same theorem in perhaps 10 different ways, using different approaches and results.
Those proofs are of no use for research, but might interest teachers and students willing to go deeper into their analysis course.
Is there a good place to publish them ? A journal for undergraduate education perhaps ? I looked on the MAA website but found the website complicated and ended up with nothing concrete.