CreateUniqueAzureStorageAccount.ps1

$resourceGroupName = "TESTSERVERS"
$location = "West US"
$storageType = "Standard_GRS"

function createStorageAccount($storageAccountPrefix) {
   $storageAccountCreated = $False

   #storage account names need to be globally unique
   #loop until we find a storage account name that works
   while ($storageAccountCreated -eq $False) {
      $randomNumber = Get-Random
      $storageName = $storageAccountPrefix + $randomNumber

      try {
         $storageAccount = New-AzureRMStorageAccount -ResourceGroupName $resourceGroupName -Name $storageName -Type $storageType -Location $location
         $storageAccountCreated = $True
      } catch {
         #turn on debug mode to see failed attempts to create storage accounts
         Write-Debug "Storage account $($storageName) was taken. Trying again..."
      }
   }

   return $storageAccount
}

$storageAccount = createStorageAccount -storagePrefix "TESTSERVERSTORE"