jetbrains-settings/atom-icon-associations.xml

<application>
  <component name="Atom Icon Associations Config">
    <option name="customFolderAssociations">
      <CustomAssociations>
        <option name="customAssociations">
          <RegexAssociation>
            <option name="matcher" value="^(utilities)$" />
            <option name="pattern" value="^(utilities)$" />
            <option name="name" value="utils" />
            <option name="icon" value="\tools.svg" />
          </RegexAssociation>
        </option>
      </CustomAssociations>
    </option>
  </component>
</application>