diff --git a/Manager.cpp b/Manager.cpp
index 0f2eb5d..4ee2372 100644
--- a/Manager.cpp
+++ b/Manager.cpp
@@ -26,12 +26,13 @@
 
 Manager::Manager (QObject *parent) :
   QObject (parent),
-  trayIcon_ (new QSystemTrayIcon (QIcon (":/images/icon.png"), this)),
+  trayIcon_ (new QSystemTrayIcon (this)),
   dictionary_ (new LanguageHelper),
   resultDialog_ (new ResultDialog (*dictionary_)),
   captureAction_ (NULL), repeatCaptureAction_ (NULL),
   repeatAction_ (NULL), clipboardAction_ (NULL),
-  useResultDialog_ (true), doTranslation_ (true) {
+  useResultDialog_ (true), doTranslation_ (true), itemProcessingCount_ (0) {
+  updateNormalIcon ();
   GlobalActionHelper::init ();
   qRegisterMetaType<ProcessingItem>();
 
@@ -215,6 +216,8 @@ void Manager::handleSelection (ProcessingItem item) {
     item.translateLanguage = defaultTranslationLanguage_;
   }
   emit requestRecognize (item);
+  ++itemProcessingCount_;
+  updateNormalIcon ();
   if (!(item.modifiers & Qt::ControlModifier)) {
     emit closeSelections ();
   }
@@ -279,7 +282,6 @@ void Manager::processTrayAction (QSystemTrayIcon::ActivationReason reason) {
 }
 
 void Manager::editRecognized (ProcessingItem item) {
-  ST_ASSERT (item.isValid ());
   QString fixed = QInputDialog::getMultiLineText (
     NULL, tr ("Правка"), tr ("Исправьте распознанный текст"), item.recognized);
   if (!fixed.isEmpty ()) {
@@ -316,7 +318,13 @@ void Manager::copyLastImageToClipboard () {
 }
 
 void Manager::showResult (ProcessingItem item) {
-  ST_ASSERT (item.isValid ());
+  --itemProcessingCount_;
+  if (!item.isValid ()) {
+    // delay because it can show error
+    QTimer::singleShot (3000, this, SLOT (updateNormalIcon ()));
+    return;
+  }
+  changeIcon (IconTypeSuccess);
   if (useResultDialog_) {
     resultDialog_->showResult (item);
   }
@@ -329,5 +337,30 @@ void Manager::showResult (ProcessingItem item) {
 
 void Manager::showError (QString text) {
   qCritical () << text;
+  changeIcon (IconTypeError);
   trayIcon_->showMessage (tr ("Ошибка"), text, QSystemTrayIcon::Critical);
 }
+
+void Manager::changeIcon (int iconType, int timeoutMsec) {
+  QString fileName;
+  switch (iconType) {
+    case IconTypeSuccess:
+      fileName = ":/images/STIconGreen.png";
+      break;
+    case IconTypeError:
+      fileName = ":/images/STIconRed.png";
+      break;
+    default:
+      return;
+  }
+  trayIcon_->setIcon (QIcon (fileName));
+  if (timeoutMsec > 0) {
+    QTimer::singleShot (timeoutMsec, this, SLOT (updateNormalIcon ()));
+  }
+}
+
+void Manager::updateNormalIcon () {
+  QString fileName = itemProcessingCount_ > 0
+                     ? ":/images/STIconOrange.png" : ":/images/STIconBlue.png";
+  trayIcon_->setIcon (QIcon (fileName));
+}
diff --git a/Manager.h b/Manager.h
index 710d6cb..adcf665 100644
--- a/Manager.h
+++ b/Manager.h
@@ -17,6 +17,10 @@ class LanguageHelper;
 class Manager : public QObject {
   Q_OBJECT
 
+  enum IconType {
+    IconTypeNormal, IconTypeWorking, IconTypeError, IconTypeSuccess
+  };
+
   public:
     explicit Manager (QObject *parent = 0);
     ~Manager ();
@@ -46,9 +50,12 @@ class Manager : public QObject {
     void showResult (ProcessingItem item);
     void showError (QString text);
 
+    void updateNormalIcon ();
+
   private:
     QMenu * trayContextMenu ();
     void updateActionsState (bool isEnabled = true);
+    void changeIcon (int iconType, int timeoutMsec = 3000);
 
   private:
     QSystemTrayIcon *trayIcon_;
@@ -65,6 +72,7 @@ class Manager : public QObject {
     QList<QThread *> threads_;
     QString defaultTranslationLanguage_;
     bool doTranslation_;
+    int itemProcessingCount_;
 };
 
 #endif // MANAGER_H
diff --git a/Recources.qrc b/Recources.qrc
index 920e5ba..67a7a5f 100644
--- a/Recources.qrc
+++ b/Recources.qrc
@@ -2,6 +2,9 @@
     <qresource prefix="/">
         <file>translations/translation_en.qm</file>
         <file>translations/translation_ru.qm</file>
-        <file>images/icon.png</file>
+        <file>images/STIconBlue.png</file>
+        <file>images/STIconGreen.png</file>
+        <file>images/STIconOrange.png</file>
+        <file>images/STIconRed.png</file>
     </qresource>
 </RCC>
diff --git a/images/STIconBlue.png b/images/STIconBlue.png
new file mode 100644
index 0000000..7ca2c3c
Binary files /dev/null and b/images/STIconBlue.png differ
diff --git a/images/STIconGreen.png b/images/STIconGreen.png
new file mode 100644
index 0000000..4892af1
Binary files /dev/null and b/images/STIconGreen.png differ
diff --git a/images/STIconOrange.png b/images/STIconOrange.png
new file mode 100644
index 0000000..9bfa7e6
Binary files /dev/null and b/images/STIconOrange.png differ
diff --git a/images/STIconRed.png b/images/STIconRed.png
new file mode 100644
index 0000000..672c573
Binary files /dev/null and b/images/STIconRed.png differ
diff --git a/images/icon.ico b/images/icon.ico
index a89f6ee..abbac3b 100644
Binary files a/images/icon.ico and b/images/icon.ico differ
diff --git a/images/icon.png b/images/icon.png
deleted file mode 100644
index 17fc2c5..0000000
Binary files a/images/icon.png and /dev/null differ