I'm releasing custom sprites and codehacks I've made here.
If you want to add it to your own project, I'm going to assume you know how to; there will be no guide here.
These were made with NewerSMBW in mind, with 1.30 headers.
These were made with Tsuru in mind, made for my (now cancelled) NSMBU hack; "Super Mario Sunset".
As of writing this, I haven't made the pull request to the main Tsuru repo yet, but I will in the future. (Please don't try to make the pull request yourself, I will do that myself when I finish fixing some things.)
These were pulled from old versions from when I was working on them, so they may or may not work.