Despicable Me Thank You Cards. Measure 5.5 inch x 4 inch. Thank party guests in fun fashion with our Despicable Me Thank You Cards. Matching envelopes and colorful Minion stickers seals included for convenient mailing to friends and family. Birthday Thank You Cards feature several Minions from the Despicable Me movies on the front and are blank on the inside. These thank you notes feature several of Gru s goofy little yellow henchmen on the front and are left blank on the inside for writing personalized messages.