I don't know what color they are, but you can certainly order vouchers. The effective date of the pass is the date that you redeem the voucher, and vouchers have no expiration date.
Just make sure that everyone in your party meets the eligibility rules posted on the member website. I'd hate to see a member spend $300 on a voucher for their neighbor/friend/traveling companion, only to have WDW decline to redeem the voucher at the gate.
In a nutshell, any immediate relative living in the same household as the deeded DVC owner is eligible.