Visual Studio template has a parameter icon to display in create project dialog. It's described as
<VSTemplate Version="3.0.0" xmlns="http://schemas.microsoft.com/developer/vstemplate/2005" Type="Project">
<TemplateData>
<Name Package="{AAFFDC1E-A1C7-47bc-B3DC-9E685DF3959B}" ID="202" />
<Description Package="{AAFFDC1E-A1C7-47bc-B3DC-9E685DF3959B}" ID="203" />
<TemplateID>Microsoft.CSharp.ActivityDesignerLibrary</TemplateID>
<Icon Package="{b3bae735-386c-4030-8329-ef48eeda4036}" ID="4600" />
So what mean
Package="{b3bae735-386c-4030-8329-ef48eeda4036}" ID="4600"
What is package and id ? How to create BitmapSource from it ?