This are free icons that you can use to decorate your gallery folders.
It so easy to use (First download the zip file to have the icons in your own computer):
1- Go to your gallery and open a folder.
2- Cilck on the folder you have create and click on ''Folder Options'' (top right).
3- Click on icon ---> Change Icon ---> Add your icon (for example the eevee one: ''draws'' if you want to use the folder to set your draws)
Now you can use it to decorate your gallery folders (including the favorite folders).