G0ldiel, is this the final version of the spell icon for you? I noticed artifacts at the edges, and they might also appear on other upgraded ones.
In the editor, I selected 134x134 (cropped two pixels from each edge), copied it, and pasted it into a new transparent 138x138 texture.
Screenshot before and after
I guess there were some typos the first time, the second example matched the first, but it all worked out — everything is great. As for the book icon, I noticed that issue myself too; I tried both reducing the pixel size and recoloring it in the editor))
Still, thanks for pointing that out and voicing the solution.
I worked through all the tabs, and a 4x increase turned out to be a great solution. I removed the artifacts after the upscale.
I'll see what can be done with the parchment — it seems to differ there.
Basically, I think the most troublesome part will be the resource icons, and whether it'll even be worth it... Overall, there will be a mod, and I think I'll create a thread later. Thanks again for the help.