Cleaning up the solution. Separating Shared.WinRT, Services and Synchronization. Removing synchronization from app. Reducing bundle size by 45mb.

Wino.Shared.WinRT/Models/Personalization/CustomAppTheme.cs

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+using System;
+using System.Threading.Tasks;
+using Windows.Storage;
+using Wino.Domain.Enums;
+using Wino.Domain.Models.Personalization;
+using Wino.Shared.WinRT.Services;
+
+namespace Wino.Shared.WinRT.Models.Personalization
+{
+    /// <summary>
+    /// Custom themes that are generated by users.
+    /// </summary>
+    public class CustomAppTheme : AppThemeBase
+    {
+        public CustomAppTheme(CustomThemeMetadata metadata) : base(metadata.Name, metadata.Id)
+        {
+            AccentColor = metadata.AccentColorHex;
+        }
+
+        public override AppThemeType AppThemeType => AppThemeType.Custom;
+
+        public override string GetBackgroundPreviewImagePath()
+            => $"ms-appdata:///local/{ThemeService.CustomThemeFolderName}/{Id}_preview.jpg";
+
+        public override async Task<string> GetThemeResourceDictionaryContentAsync()
+        {
+            var customAppThemeFile = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///AppThemes/Custom.xaml"));
+            return await FileIO.ReadTextAsync(customAppThemeFile);
+        }
+    }
+}

Wino.Shared.WinRT/Models/Personalization/PreDefinedAppTheme.cs

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+using System;
+using System.Threading.Tasks;
+using Windows.Storage;
+using Wino.Domain.Enums;
+using Wino.Domain.Models.Personalization;
+
+namespace Wino.Shared.WinRT.Models.Personalization
+{
+    /// <summary>
+    ///  Forest, Nighty, Clouds etc. applies to pre-defined themes in Wino.
+    /// </summary>
+    public class PreDefinedAppTheme : AppThemeBase
+    {
+        public PreDefinedAppTheme(string themeName,
+                                  Guid id,
+                                  string accentColor = "",
+                                  ApplicationElementTheme forcedElementTheme = ApplicationElementTheme.Default) : base(themeName, id)
+        {
+            AccentColor = accentColor;
+            ForceElementTheme = forcedElementTheme;
+        }
+
+        public override AppThemeType AppThemeType => AppThemeType.PreDefined;
+
+        public override string GetBackgroundPreviewImagePath()
+            => $"ms-appx:///BackgroundImages/{ThemeName}.jpg";
+
+        public override async Task<string> GetThemeResourceDictionaryContentAsync()
+        {
+            var xamlDictionaryFile = await StorageFile.GetFileFromApplicationUriAsync(new Uri($"ms-appx:///AppThemes/{ThemeName}.xaml"));
+            return await FileIO.ReadTextAsync(xamlDictionaryFile);
+        }
+    }
+}

Wino.Shared.WinRT/Models/Personalization/SystemAppTheme.cs

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+using System;
+using Wino.Domain.Enums;
+
+namespace Wino.Shared.WinRT.Models.Personalization
+{
+    // Mica - Acrylic.
+    public class SystemAppTheme : PreDefinedAppTheme
+    {
+        public SystemAppTheme(string themeName, Guid id) : base(themeName, id, "") { }
+
+        public override AppThemeType AppThemeType => AppThemeType.System;
+    }
+}