Ok, I lied. I got enough stuff bouncing around my head that I need to wrap some things up. Besides, it works better if I only read a few monsters at a time.
I think I got the originals of these from Pathfinder. Not really sure, because that was before I started keeping notes of where I copy and pasted stuff from. Here's a few more options for your 5e sorcerer to spend your sorcery points on.
These metamagic options are now available on the DM's Guild, Grognard's Grimoire: Sorcerer!