i also wrote one that let's you use a Red and Green image as UV and map an image onto it but it's very awkward to use and it often lead to buggy results if i finish it ill post it
I copied your stuff manually but you can also contribute directly to the repo
https://github.com/LAGameStudio/Tilemancer-Nodes
tutorial on pull requests:
1. Visit Tilemancer-Nodes
2. Edit a file (pencil icon) or Create File
3. Edit / add code
4. Submit / describe / create pull request