Those choices can quickly take a chunk out of your pocketbook. If the main color of your invitations is white, ivory or a similiar color, matching envelope liners are unnescessary. Black print is always elegant, and always cheaper than colored ink. You really don't need 25 more invitations than you think you need. Five to ten additional invitations is usually sufficient.
Inner envelopes are unnecessary.
They only add more expense. Blotting paper makes no sense in this day and age. It's original purpose was to cover the invitation while the ink dried. Your invitations don't have to match your wedding colors. None of your guests will notice if they do or not.