diff -r 6e8b807bda4b -r ba39a1d396c0 QTfrontend/model/ThemeModel.cpp
--- a/QTfrontend/model/ThemeModel.cpp	Sun Jun 10 18:56:51 2018 +0200
+++ b/QTfrontend/model/ThemeModel.cpp	Sun Jun 10 19:12:26 2018 +0200
@@ -33,21 +33,48 @@
     m_themesLoaded = false;
 
     m_filteredNoDLC = NULL;
+    m_filteredNoHidden = NULL;
+    m_filteredNoDLCOrHidden = NULL;
 }
 
-QSortFilterProxyModel * ThemeModel::withoutDLC()
+// Filters out DLC themes, e.g. themes which do not come by default
+ThemeFilterProxyModel * ThemeModel::withoutDLC()
 {
     if (m_filteredNoDLC == NULL)
     {
-        m_filteredNoDLC = new QSortFilterProxyModel(this);
+        m_filteredNoDLC = new ThemeFilterProxyModel(this);
         m_filteredNoDLC->setSourceModel(this);
-        // filtering based on IsDlcRole would be nicer
-        // but seems this model can only do string-based filtering :|
-        m_filteredNoDLC->setFilterRegExp(QRegExp("^[^*]"));
+        m_filteredNoDLC->setFilterDLC(true);
     }
     return m_filteredNoDLC;
 }
 
+// Filters out hidden themes, these are themes which are not supposed to be
+// seen by the user.
+ThemeFilterProxyModel * ThemeModel::withoutHidden()
+{
+    if (m_filteredNoHidden == NULL)
+    {
+        m_filteredNoHidden = new ThemeFilterProxyModel(this);
+        m_filteredNoHidden->setSourceModel(this);
+        m_filteredNoHidden->setFilterHidden(true);
+    }
+    return m_filteredNoHidden;
+}
+
+// Combination of the two above for convenience
+ThemeFilterProxyModel * ThemeModel::withoutDLCOrHidden()
+{
+    if (m_filteredNoDLCOrHidden == NULL)
+    {
+        m_filteredNoDLCOrHidden = new ThemeFilterProxyModel(this);
+        m_filteredNoDLCOrHidden->setSourceModel(this);
+        m_filteredNoDLCOrHidden->setFilterDLC(true);
+        m_filteredNoDLCOrHidden->setFilterHidden(true);
+    }
+    return m_filteredNoDLCOrHidden;
+}
+
 int ThemeModel::rowCount(const QModelIndex &parent) const
 {
     if(parent.isValid())
@@ -95,16 +122,42 @@
 
     foreach (QString theme, themes)
     {
+        QMap<int, QVariant> dataset;
+
         // themes without icon are supposed to be hidden
         QString iconpath = QString("physfs://Themes/%1/icon.png").arg(theme);
 
         if (!QFile::exists(iconpath))
-            continue;
-
-        QMap<int, QVariant> dataset;
+        {
+            dataset.insert(IsHiddenRole, true);
+        }
+        else
+        {
+            // themes with the key “hidden” in theme.cfg are hidden, too
+            QFile themeCfgFile(QString("physfs://Themes/%1/theme.cfg").arg(theme));
+            if (themeCfgFile.open(QFile::ReadOnly))
+            {
+                QTextStream stream(&themeCfgFile);
+                QString line = stream.readLine();
+                QString key;
+                while (!line.isNull())
+                {
+                    key = QString(line);
+                    int equalsPos = line.indexOf('=');
+                    key.truncate(equalsPos - 1);
+                    key = key.simplified();
+                    if (!line.startsWith(';') && key == "hidden")
+                    {
+                        dataset.insert(IsHiddenRole, true);
+                        break;
+                    }
+                    line = stream.readLine();
+                }
+            }
+        }
 
         // detect if theme is dlc
-        QString themeDir = PHYSFS_getRealDir(QString("Themes/%1/icon.png").arg(theme).toLocal8Bit().data());
+        QString themeDir = PHYSFS_getRealDir(QString("Themes/%1").arg(theme).toLocal8Bit().data());
         bool isDLC = !themeDir.startsWith(datadir->absolutePath());
         dataset.insert(IsDlcRole, isDLC);
 
@@ -118,8 +171,12 @@
         dataset.insert(Qt::DisplayRole, (isDLC ? "*" : "") + theme);
 
         // load and set preview icon
-        QIcon preview(QString("physfs://Themes/%1/icon@2x.png").arg(theme));
-        dataset.insert(Qt::DecorationRole, preview);
+        iconpath = QString("physfs://Themes/%1/icon@2x.png").arg(theme);
+        if (QFile::exists(iconpath))
+        {
+            QIcon preview(QString("physfs://Themes/%1/icon@2x.png").arg(theme));
+            dataset.insert(Qt::DecorationRole, preview);
+        }
 
         m_data.append(dataset);
     }