Set-ConsoleColors.ps1

function Set-ConsoleColors {
    param ([string]$theme = "campbell")

    # Following source adapted from https://github.com/Microsoft/console/tree/master/tools/ColorTool
    add-type -TypeDefinition @'
using System;
using System.Runtime.InteropServices;

namespace ColorTool
{
    public class ConsoleAPI
    {
        [StructLayout(LayoutKind.Sequential)]
        struct COORD
        {
            public short X;
            public short Y;
        }

        [StructLayout(LayoutKind.Sequential)]
        struct SMALL_RECT
        {
            public short Left;
            public short Top;
            public short Right;
            public short Bottom;
        }

        [StructLayout(LayoutKind.Sequential)]
        struct CONSOLE_SCREEN_BUFFER_INFO_EX
        {
            public uint cbSize;
            public COORD dwSize;
            public COORD dwCursorPosition;
            public short wAttributes;
            public SMALL_RECT srWindow;
            public COORD dwMaximumWindowSize;

            public ushort wPopupAttributes;
            public bool bFullscreenSupported;

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
            public uint[] ColorTable;

            public static CONSOLE_SCREEN_BUFFER_INFO_EX Create()
            {
                return new CONSOLE_SCREEN_BUFFER_INFO_EX { cbSize = 96 };
            }
        }

        [DllImport("kernel32.dll", SetLastError = true)]
        static extern IntPtr GetStdHandle(int nStdHandle);

        [DllImport("kernel32.dll", SetLastError = true)]
        static extern bool GetConsoleScreenBufferInfoEx(IntPtr hConsoleOutput, ref CONSOLE_SCREEN_BUFFER_INFO_EX ConsoleScreenBufferInfo);

        [DllImport("kernel32.dll", SetLastError = true)]
        static extern bool SetConsoleScreenBufferInfoEx(IntPtr ConsoleOutput, ref CONSOLE_SCREEN_BUFFER_INFO_EX ConsoleScreenBufferInfoEx);

        public static uint RGB(int r, int g, int b)
        {
            return (uint)r + (((uint)g) << 8) + (((uint)b) << 16);
        }

        public static bool SetConsoleProperties(uint[] colorTable)
        {
            CONSOLE_SCREEN_BUFFER_INFO_EX csbiex = CONSOLE_SCREEN_BUFFER_INFO_EX.Create();
            int STD_OUTPUT_HANDLE = -11;
            IntPtr hOut = GetStdHandle(STD_OUTPUT_HANDLE);
            bool success = GetConsoleScreenBufferInfoEx(hOut, ref csbiex);
            if (success)
            {
                csbiex.srWindow.Bottom++;
                for (int i = 0; i < 16; i++)
                {                    
                    csbiex.ColorTable[i] = colorTable[i];
                }
                SetConsoleScreenBufferInfoEx(hOut, ref csbiex);
            }

            return success;
        }
    }
}
'@

    # Campbell, RedAlert and SolarLight color schemes
    $campbell = 789516,14300928,958739,14521914,2035653,9967496,40129,13421772,7763574,16742459,837142,14079585,5654759,10354868,10875385,15921906
    $redalert = 2303094,15571783,7061105,12107371,5058261,14055656,7059646,14079702,2500134,15772005,9171119,14540727,5448928,14661597,12049887,16777215
    $solarlight = 14939901,13798182,39301,10002730,3093212,12874092,35253,10592659,8616805,13798182,39301,10002730,3093212,12874092,35253,7695960 

    $colors = $campbell
    if ([string]::Compare($theme, "redalert", $true) -eq 0) {
        $colors = $redalert
    } elseif ([string]::Compare($theme, "solarlight", $true) -eq 0) {
        $colors = $solarlight
    }

    
    [ColorTool.ConsoleAPI]::SetConsoleProperties($colors) | Out-Null
}