Giddy Up Horse Themed Novelty Party Invitations and Green Envelopes - Pack of 8 These adorable Giddy Up Horse Themed Novelty Party Invitations come with Green Envelopes. Sold in a pack of 8. Diecut design. Each invitation measures approximately 5"x6". Includes fill in the blanks, as follows: For, Date, Time, Place, RSVP.