diff --git a/src/IpcManager.cs b/src/IpcManager.cs
index 1faffaf..a31177c 100644
--- a/src/IpcManager.cs
+++ b/src/IpcManager.cs
@@ -66,9 +66,9 @@ public void ProcessArgs(string[] initialArgs)
         {
             foreach (string arg in initialArgs)
             {
-                if (arg.ToLower().StartsWith("/theme") && arg.IndexOf('=') != -1)
+                if (arg.StartsWith("/theme", StringComparison.OrdinalIgnoreCase) && arg.IndexOf('=') != -1)
                 {
-                    ProcessThemeArg(arg.ToLower());
+                    ProcessThemeArg(arg);
                 }
                 else if (arg.StartsWith('/'))
                 {
@@ -104,9 +104,9 @@ private void ProcessArgs(ApplicationContext app, string[] args)
 
             foreach (string arg in args)
             {
-                if (arg.ToLower().StartsWith("/theme") && arg.IndexOf('=') != -1)
+                if (arg.StartsWith("/theme", StringComparison.OrdinalIgnoreCase) && arg.IndexOf('=') != -1)
                 {
-                    string themeId = ProcessThemeArg(arg.ToLower());
+                    string themeId = ProcessThemeArg(arg);
                     if (themeId != null)
                     {
                         ThemeShuffler.AddThemeToHistory(themeId);
@@ -153,11 +153,11 @@ private string ProcessThemeArg(string arg)
                 return null;
             }
 
-            if (arg.StartsWith("/theme="))
+            if (arg.StartsWith("/theme=", StringComparison.OrdinalIgnoreCase))
             {
                 JsonConfig.settings.activeThemes[0] = themeId;
             }
-            else if (arg.StartsWith("/theme:L="))
+            else if (arg.StartsWith("/theme:L=", StringComparison.OrdinalIgnoreCase))
             {
                 JsonConfig.settings.lockScreenTheme = themeId;
                 JsonConfig.settings.lockScreenDisplayIndex = -1;
diff --git a/src/resources/default_themes.yaml b/src/resources/default_themes.yaml
index 46df22b..1ddce69 100644
--- a/src/resources/default_themes.yaml
+++ b/src/resources/default_themes.yaml
@@ -38,6 +38,11 @@ Peak:
 - https://gitlab.com/t1m0thyj/wdd-themes/-/package_files/50073297/download
 - https://bitbucket.org/t1m0thyj/wdd-themes/downloads/Peak.ddw
 
+Sequoia_Abstract:
+- https://github.com/t1m0thyj/WDD-mac-themes/releases/download/sequoia/Sequoia_Abstract.ddw
+- https://gitlab.com/t1m0thyj/wdd-themes/-/package_files/144851881/download
+- https://bitbucket.org/t1m0thyj/wdd-themes/downloads/Sequoia_Abstract.ddw
+
 Solar_Gradients:
 - https://github.com/t1m0thyj/WDD-mac-themes/releases/download/mojave/Solar_Gradients.ddw
 - https://gitlab.com/t1m0thyj/wdd-themes/-/package_files/50073163/download
diff --git a/src/resources/images/Sequoia_Abstract_day.jpg b/src/resources/images/Sequoia_Abstract_day.jpg
new file mode 100644
index 0000000..4450af9
Binary files /dev/null and b/src/resources/images/Sequoia_Abstract_day.jpg differ
diff --git a/src/resources/images/Sequoia_Abstract_night.jpg b/src/resources/images/Sequoia_Abstract_night.jpg
new file mode 100644
index 0000000..8e8f81d
Binary files /dev/null and b/src/resources/images/Sequoia_Abstract_night.jpg differ
diff --git a/src/resources/images/Sequoia_Abstract_thumbnail.jpg b/src/resources/images/Sequoia_Abstract_thumbnail.jpg
new file mode 100644
index 0000000..c8705b3
Binary files /dev/null and b/src/resources/images/Sequoia_Abstract_thumbnail.jpg differ