Status Bar with pre-generated images. Permutation. Combination. Two Lists

Hi,

I have a algorithmic problem. 

I am writing an application in .net (c#). First of all a small snippet:

var apps = new List<string>() { "app1", "app2", "app3" };
var colors = new List<Color>() { Colors.Green, Colors.Yellow, Colors.Red};

var possibilities = apps.SelectMany(app => colors, (app, color) => new ImageColorCombination(app, color)).ToList();


// missing logic



// classes
public class Image{
   public List<ImageColorCombination> Parts {get;set;}
}

public class ImageColorCombination {
   public String Name{get;set;}
   public Color Color{get;set;}
}

I want to create a statusbar. Showing the status (red, yellow, green) for each app. The mail problem is, that there is no way to create the full image (merged all 3 app images) at runtime. so i have to create all possible images before. later on i only want to open the pre-generated files if the status of a specific app has changed.

I hope you understand my problem. 

I know this is not the best style but the only possiblity cause i have no ui thread to create the status bar on the fly. It is also not the best way to generate so many images but like i said there is no other way in this project. 

So i hope you can help me with this problem.

The result should be:

1. Image: app1 (red)   app2 (red)   app3 (red)

2. Image: app1 (yellow)   app2 (yellow)   app3 (yellow)

3. Image: app1 (green)   app2 (green)   app3 (green)

4. Image: app1 (green)   app2 (green)   app3 (yellow)

...

n. Image: app1 (green)   app2 (green)   app3 (red)

One Image for each possible combination.

Windows, SharePoint, jQuery, knockout.js, etc. - All known technologies, but please mark posts as answered where appropriate ;)