Wedding cards should match and have the same design of your wedding theme. The modern and sophisticated way to write the wedding invites is to use a love poem, wedding verse or write something that will match the wedding theme.
Another way you can go is to create your own templates. You can base these around the types of articles you enjoy or you can visit other directories to see if you can find a general idea that gives you the ability to come up with your own template. Using your own articles may help you come up with your own templates as well. If your articles are along the same lines, you should be able to come up with a number of templates. Those will give you ideas for new articles and that for sure will help you get through your writer's block.