M's birthday party is this weekend. After much discussion, it was decided to have it at a local coffee shop in their loft (our apartment is too small for more than two or three kids) and play horse riding/jumping games. For invites, we made show ribbons. On the front is a stamp of a horse, and on the back is a bigger circle with all the party info. We may make thank you cards that are similar. Haven't decided yet :)
I will post more about the party next week after the event. Wish me luck!