Use a feed icon included with the app (instead of the app icon) as the icon for NetNewsWire feeds.

Mac/AppAssets.swift

@@ -48,6 +48,8 @@ struct AppAssets {
 		return RSImage(named: "accountTheOldReader")
 	}()
 
+	static let nnwFeedIcon = RSImage(named: "feedIcon")!
+
 	@available(macOS 11.0, *)
 	static var addNewSidebarItemImage: RSImage = {
 		return NSImage(systemSymbolName: "plus", accessibilityDescription: nil)!

Mac/Resources/Assets.xcassets/FeedIcon.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "filename" : "FeedIcon 2.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "FeedIcon.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "filename" : "FeedIcon 1.png",
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Shared/Extensions/RSImage-AppIcons.swift

@@ -33,4 +33,6 @@ extension IconImage {
 		}
 		return nil
 	}()
+
+	static let nnwFeedIcon = IconImage(AppAssets.nnwFeedIcon)
 }

Shared/Favicons/FaviconDownloader.swift

@@ -123,7 +123,7 @@ final class FaviconDownloader {
 
 		if let url = URL(string: homePageURL) {
 			if url.host == "nnw.ranchero.com" || url.host == "netnewswire.blog" {
-				return IconImage.appIcon
+				return IconImage.nnwFeedIcon
 			}
 		}
 

Shared/Images/FeedIconDownloader.swift

@@ -52,7 +52,7 @@ public final class FeedIconDownloader {
 		}
 		
 		if let homePageURLString = feed.homePageURL, let homePageURL = URL(string: homePageURLString), (homePageURL.host == "nnw.ranchero.com" || homePageURL.host == "netnewswire.blog") {
-			return IconImage.appIcon
+			return IconImage.nnwFeedIcon
 		}
 
 		func checkHomePageURL() {