Well that’s embarrassing. My brain is a bit melted after a month straight of making and organizing icons.

A bunch! First I used Affinity Designer to work on the more complex icons, then I have another SVG editor called Boxy I use for smaller edits because it doesn’t mess with metadata. Then I used many terminal commands to mass edit the files, such as applying a colour fill or the accent fill. I’ve got another app that optimized the SVG files into similar structures to also help with the terminal commands. Also I found this cool app on my Mac that lets me export an entire font as individual SVG files, so it let me add the whole Google Noto emoji library as proper glyphs that work with my theme. I also ran some command on the emojis to rename them to their proper emoji names from their Unicode ID. I also used a spreadsheet to sort out my commands and colours.

So plenty of apps! 😅

Nothing 🪄

It just works. I put a ton of work making sure it just works. I even exported my theme in different coloured variants so people don’t have to try and mess with icons to get them how they want.

At least in KDE for the accents. The rest follows the open desktop standard so it should be pretty universal.

I also made sure to include “symbolic” versions to improve functionality on Ubuntu, though I’ve yet to try it on Ubuntu….

I haven't bothered with icon theming, but I think icons are pretty much universally compatible.

On kde plasma and some other desktops you can change the icons in settings. If your de doesn't have that option, there should be (more or less janky) workarounds for that. Look up how to do that for your specific de.