You can get a list of Embedded resources (Images, etc) within a .NET application using the following code:
System.Reflection.Assembly.GetExecutingAssembly().GetManifestResourceNames()
Then, if you'd like to display that image in (for example) an Excel Sheet cell, you can use the following:
Workbookwb = objExcel.ActiveWorkbook;
Worksheet sheet = (Worksheet)wb.Sheets[1];
Range rng = sheet.get_Range("V2", "V2");
System.IO.Stream myStream = System.Reflection.Assembly.GetExecutingAssembly().GetManifestResourceStream("<EmbeddedResourceNameGoesHERE.jpg>");
System.Drawing.Image img = null;
img = System.Drawing.Image.FromStream(myStream);
forms.Clipboard.SetImage(img);
rng.Select();
sheet.Paste(System.Type.Missing, System.Type.Missing);