Here you can share any custom templates you've made, simply place the .ken (and optionally the .png file) in the /assets/ folder or anywhere on your PC and use the "Load from file..." option.

Power-up template (by Gee It Some Laldy)

Download:
https://geeitsomelaldy.itch.io/kenney-studio-templ...

It would be awesome if you could batch-edit tiles, so an entire tileset would change color instead of having to change each one individually.