If you want to contribute to Delta by providing icons please do so by creating a SVG icon, cloning this repo and issuing a pull request.
Symbolic links of icons can be created with ln -s (original icon).svg (symlink).svg in a terminal.
A basic guide to creating icon themes can be found here: https://wiki.gnome.org/Attic/GnomeArt/Tutorials/IconThemes
- index.theme outlines the file structure and properties of the icons. If you are adding additional folders, make sure to reflect the changes in this file.
Place SVGs in the correct place in the file structure (e.g. application icons under applications, MIME type icons under mimetypes).

When saving the SVG, save it as an Optimized SVG to reduce hard disk space.
If you use the text tool on the icon, it is strongly recommended to convert the text using Object to Path, this is so it can display correctly in the DEs (Desktop Environments).
Clipping and Masking can't be used as it will not be correctly displayed in DEs and other applications, instead use Union, Difference, Intersection, etc.

Resources for Contributions

(Right-Click → Save as)

Font

Now (Use Now Alt from the same family for alternate lowercase "a") (Make sure to convert font to path on SVG before saving.)