This offer has been extended through today (3/7/15):

Awesome deal at Tiny Prints!  If you are a new customer, you can get a FREE personalized mug (valued at $15.99) through 11:59 P.M. PT March 7, 2015.  You’ll need to use the code TPFREEMUG at check-out.  It appears you also need purchase at least $1 worth of other items as a minimum purchase and pay shipping costs.
Fine Print: 
Offer expires 3/7/2015 (11:59 P.M. PT). Use code TPFREEMUG at checkout to enjoy one (1) free mug. There is a $1 minimum purchase required for this promotion. This offer is not applicable to previously placed orders or toward the purchase of calendars, photo books, gift certificates, personalized postage stamps and Erin Condren weekly planners. Valid only for new Tiny Prints customers (those who have never purchased from Tiny Prints). Offer cannot be redeemed more than once per account, household and/or billing address. This particular offer code can only be redeemed once. Offer is only valid on Tiny Prints and is not applicable to third party or partner websites. To prevent fraud or abuse, we reserve the right to discontinue or modify this offer or cancel any order.