NikitaM
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This is related to how these icons were saved. They were saved in the same way as creature textures, with Mip Maps being generated. Simply saving these icons without generating Mip Maps will fix the issue.
Added 3 minutes later
I decided to finish the elementals. I'm currently working on a puzzle map and a demon summoning spell. The old "Conflux" (elemental fusion) will now be a fortress – under guard and belonging to the player who captures it.
As for the elementals, it's good that you're completely finishing the city before moving on to another, because I've seen unfinished mods that are so unpleasant to look at, let alone play.