According to the
Icons_Resources.xml file (from.. Base/Assets/UI/Icons folder) there are a few extra sizes more than the default 64x64.
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<IconTextureAtlases>
<Row Name="ICON_ATLAS_RESOURCES" IconSize="64" IconsPerRow="8" IconsPerColumn="8" Filename="Resources.dds"/>
<Row Name="ICON_ATLAS_RESOURCES" IconSize="38" IconsPerRow="8" IconsPerColumn="8" Filename="Resources38.dds"/>
<Row Name="ICON_ATLAS_RESOURCES" IconSize="50" IconsPerRow="8" IconsPerColumn="8" Filename="Resources50.dds"/>
<Row Name="ICON_ATLAS_RESOURCES" IconSize="256" IconsPerRow="8" IconsPerColumn="8" Filename="Resources256.dds"/>
<Row Name="ICON_ATLAS_RESOURCES_FOW" IconSize="64" IconsPerRow="8" IconsPerColumn="8" Filename="Resources_FOW.dds"/>
</IconTextureAtlases>
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Two of them smaller @ 38 & 50. I'm fairly certain 256 is for Civilopedia articles.
Haven't checked the Units/Flags though.. but i suspect they should also have a variety of sizes.
Of course, such assets are still packaged into the newest BLP archives format .. thus --as you already mentionned
@heinous_hat-- we most likely won't be able to assign any of these alternate values until we get our hands on the official SDK.