There is abundant free materials that can be found on the internet. If you are looking for an invitation template, you can find a lot of interesting choices. You can download most of them for free and maybe others will charge a minimum amount.
Birthday party invitations will usually be a fun thing to look for themes. There are several themes that you can make such inspiration, adventure at sea, fairytale land. It would be strange design to get every kid excited. However, free invitation not only for children.
Before you get lost in some of the many sites offering free birthday card invitation to you, at least you should have an idea of your liking. This can save time when searching on the internet. If you are planning a party premises motive, maybe you could check the same theme or topic. If you decide to print the invitations yourself, make sure that you really can manage it.
