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随便玩一下：结果值自己套用，看是不是你要的。

@Echo Off  & cd /d "%~dp0"
SetLocal EnableDelayedExpansion

set "Color=0123456789ABCDEF"
set /a n=%random% %% 16
set "BackColor=!Color:~%n%,1!"
for /f "tokens=1,2 delims=%BackColor%" %%a in ("%Color%") do set "Color=%%a%%b"

set/a m=15
:LOOP
set/a n=%random% %% %m%
set "ColTmp=!Color:~%n%,1!"
for /f "tokens=1,2 delims=%ColTmp%" %%a in ("%Color%") do set "Color=%%a%%b"
set "_COL%m%=%BackColor%%ColTmp%"
if %m% geq 2 (set/a m-=1 &goto LOOP)

set _COL
Pause
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----------PS---------------

$颜色字符 ='0123456789ABCDEF';
$背景色 =Get-Random -input ([Char[]]$颜色字符);
$颜色字符 =$颜色字符 -replace $背景色;

$颜色 = While ( ([Char[]]$颜色字符).Count -gt 0 ) {
	$前景色 =Get-Random -input ([Char[]]$颜色字符);
	[string]::Concat($背景色,$前景色);
	$颜色字符 =$颜色字符 -replace $前景色;
}
$颜色;
cmd /c Pause
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