diff --git a/README.md b/README.md
index a316304..82bdaa3 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,9 @@ Kosmorro's logo is composed of the "Kosmorro" name in lower case, the last "o" b
 - **Available color themes:**
     - Dark, recommended for display on light background or print
     - Light, recommended for display on dark background
+    - Grey, recommended when the background color cannot be predicted
+
+      **Note:** the grey theme should be used only when the dark and light ones cannot for some reason.
 
 The font used in the full logo is [Raleway](https://www.theleagueofmoveabletype.com/raleway), created by Matt McInerney and distributed by [the League of Moveable Type](https://www.theleagueofmoveabletype.com) under the terms of the [SIL Open Font License](https://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=OFL_web).
 
@@ -32,4 +35,9 @@ The font used in the full logo is [Raleway](https://www.theleagueofmoveabletype.
         <td><img src="svg/kosmorro-logo-white.svg" alt="" />
         <td><img src="svg/kosmorro-icon-white.svg" alt="" />
     </tr>
+    <tr>
+        <th>Grey theme</th>
+        <td><img src="svg/kosmorro-logo-grey.svg" alt="" />
+        <td><img src="svg/kosmorro-icon-grey.svg" alt="" />
+    </tr>
 </table>
diff --git a/png/kosmorro-icon-grey.png b/png/kosmorro-icon-grey.png
new file mode 100644
index 0000000..be00f87
Binary files /dev/null and b/png/kosmorro-icon-grey.png differ
diff --git a/png/kosmorro-logo-grey.png b/png/kosmorro-logo-grey.png
new file mode 100644
index 0000000..12a1912
Binary files /dev/null and b/png/kosmorro-logo-grey.png differ
diff --git a/svg/kosmorro-icon-grey.svg b/svg/kosmorro-icon-grey.svg
new file mode 100644
index 0000000..3bd5fdd
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