If you pledge at the Rose Breeder level, part of the reward is that you get to design an Order Card. That is to say, you get to design it pretty much completely. You do have to stay within the template and use the art assets for the game itself and it has to be reasonably socially acceptable.
Use art assets from the game. For example, no Purple Daises.
It has to be family acceptable according to me. That means, not vulgar, racist, sexist, or too gross etc. This should go without saying but hey, it's 2019...
You can use your name, a friend's name, a made up name etc providing it's not copyrighted i.e. No 'Dear Voldemort.... Thanks Harry' kind of thing.
You can use quotes if they are properly attributed and fact checked.
You can dedicate the card to people you know or events, providing it is respectful and 'dignified' according to me. (ie. No celebrating someone being hit by a bus. )
Due to the nature of the game and the temporal and polarizing nature of Politics and Religion, you should avoid those.
I am the final arbitrator. I am flexible, and understanding, but I am also ultimately the one that would get sued should something go wrong. ;-) I will work with you on all of this, but my decisions are ultimately final.
It may seem like a lot of rules, but when you consider that this will be part of the game, and seen around the world, you can see how you might want to make a good impression. Right?
You are also entitled to an embroidered Draw Bag. You can have anything Text or Line Art you like put onto the bag because this is your personal bag sent to just you and won't be included in every copy of the game. So providing that it fits on the bag and it Text or Line Art, you can do it. I'll help you get the sizing etc right.