Originally Posted by KLM

KLM Crown Lounge voucher

Gold and Platinum members can spend Miles to purchase KLM Crown Lounge vouchers.As Gold or Platinum member you are familiar with the quiet, comfortable atmosphere in the lounges, the business facilities, friendly staff ready to assist you, showers at your disposal (Platinum members only) and more. We can now offer you this as well if you are not flying with KLM, AIR FRANCE or one of the SkyTeam partners.
Spending possibilities
A set of Crown Lounge vouchers can be obtained for 15,000 Award Miles (1 set consists of 5 Crown Lounge vouchers).

Conditions
This option is only available for Flying Blue Platinum and Gold Elite members regardless of the airline flown.
Vouchers can only be ordered/obtained via the KLM Crown Lounges at Schiphol Airport (not via Flying Blue Customer Service Centre or the Internet).
KLM Crown Lounge vouchers are valid for 1 year from the date of issuance.
KLM Crown Lounge vouchers are not transferable or refundable. They can only be used by the Flying Blue member himself.
Each voucher is good for a single admittance to the KLM Crown Lounges at Schiphol Airport.
Valid only at KLM Crown Lounges at Schiphol Airport.