One way for making the birthday invitation template is using best colour. You can use different colour than basic colour in your invitation. Using different colour for the birthday should adding different sense.
The design of the birthday invitation template should be adjusted and matched with your birthday event concept.
If you are looking for an idea for making your birthday invitation template, maybe this birthday invitation cards can be selection.
Choosing an idea for your special invitation should be based on your own passion. If you like new nuance, maybe this can be your reference for making different birthday invitation template.