Welcome.
These are the source files for the Flatlands theme for Nokia Belle FP2.
There are over 200 third party icons, which you can find the definitions for in icons.xml. This theme has visual bugs and inconsistencies, because creating a white theme is difficult for this release due to unaccessible elements. Some of them can be corrected, others need system modifications.
Please modify these files to your own liking; let me know if you make something out of them. Preview available here: https://yellowbark.svbtle.com/flatlands-for-nokia-belle
For an alternative dark theme, please take a look at Shadow.