PowerShell Prompt to Countdown Hanukkah

PSHanukkahPrompt.ps1

#this prompt counts down to the first day of Hanukkah 2017
<#
It appears that some of the special characters I was using aren't supported in Windows 10 unless you are using Raster fonts.
[CHAR]14 is supposed to be a musical note and [CHAR]15 is like a snowflake. 
You can select any other character you want, or none at all.
#>

Function Prompt {
    #get current year
    $year = (Get-Date).year
    #get a timespan between Hanukkah for this year and now
    $time=[datetime]"12 December $year" - (Get-Date)
    #turn the timespan into a string and strip off the milliseconds
    $timestring = $time.ToString().Substring(0,10)
    #this won't really work unless using Raster fonts for your console
    #get random string of decorative characters
    #$front = -join (14,15,42 | Get-Random -Count 2 | Foreach { $_ -as [char] })
    #$back = -join (14,15,42 | Get-Random -Count 2 | Foreach { $_ -as [char] })
    $front = "*"
    $back = "*"
    $text="[{0}Hanukkah begins {1}{2}]" -f $front,$timestring,$back
    #get each character in the text and randomly assign each a color
    $text.tocharArray() | foreach {
    $i = Get-Random -Minimum 1 -Maximum 20
    Switch ($i) {
      {$i -le 20 -and $i -gt 15} { $color = "Blue"}
      {$i -le 16 -and $i -gt 10} { $color = "Yellow" }
      {$i -le 10 -and $i -gt 5} { $color = "DarkBlue" }
      default { $color = "White" }
    }
    #write each colorized character
    Write-Host $_ -nonewline -foregroundcolor $color -BackgroundColor Gray
    } #foreach
    #the function needs to write something to the pipeline
    #Write (" PS " + (Get-Location) + "> ")
    Write "PS $($executionContext.SessionState.Path.CurrentLocation)$('>' * ($nestedPromptLevel + 1)) "
} #end function