BuildMonitor.cs

using Microsoft.TeamFoundation.Build.Client;
using Microsoft.TeamFoundation.Client;
using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Timers;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            var builds = GetBuildInfo();
            if (builds.Any(i => i.Status == BuildStatus.Failed))
            {
                SetColor(Color.FromArgb(200,40,40));
            }
            else if (builds.Any(i => i.Status == BuildStatus.PartiallySucceeded))
            {
                SetColor(Color.FromArgb(200, 150, 40));                       
            }
            else
            {
                SetColor(Color.FromArgb(0, 0, 0));       
            }
        }

        private static IEnumerable<IBuildDetail> GetBuildInfo()
        {
            var server = TfsTeamProjectCollectionFactory.GetTeamProjectCollection(new Uri("http://tfs:8080/tfs/"));
            server.EnsureAuthenticated();
            var buildServer = server.GetService<IBuildServer>();

            var spec = buildServer.CreateBuildDetailSpec("*", "*");
            spec.QueryOrder = BuildQueryOrder.StartTimeDescending;
            spec.Status = BuildStatus.InProgress | BuildStatus.Succeeded | BuildStatus.PartiallySucceeded | BuildStatus.Failed;
            spec.MinFinishTime = DateTime.Now.AddDays(-7).Date;                        
            spec.InformationTypes = new string[0]; // Don't return extra information. We are only interested in the basic build info.

            var result = buildServer.QueryBuilds(spec);
            return result.Builds;
        }


        public static void SetColor(Color color)
        {

            // Remove the current wallpaper
            NativeMethods.SystemParametersInfo(
                NativeMethods.SPI_SETDESKWALLPAPER,
                0,
                "",
                NativeMethods.SPIF_UPDATEINIFILE | NativeMethods.SPIF_SENDWININICHANGE);

            // Set the new desktop solid color for the current session
            int[] elements = { NativeMethods.COLOR_DESKTOP };
            int[] colors = { System.Drawing.ColorTranslator.ToWin32(color) };
            NativeMethods.SetSysColors(elements.Length, elements, colors);

            // Save value in registry so that it will persist
            RegistryKey key = Registry.CurrentUser.OpenSubKey("Control Panel\\Colors", true);
            key.SetValue(@"Background", string.Format("{0} {1} {2}", color.R, color.G, color.B));
        }

        private static class NativeMethods
        {
            public const int COLOR_DESKTOP = 1;
            public const int SPI_SETDESKWALLPAPER = 20;
            public const int SPIF_UPDATEINIFILE = 0x01;
            public const int SPIF_SENDWININICHANGE = 0x02;

            [DllImport("user32.dll")]
            public static extern bool SetSysColors(int cElements, int[] lpaElements, int[] lpaRgbValues);

            [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
            public static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni);
        }

    }
}