The best and most obvious aspect of your communion invitation should be its design, both the envelope and the invitation itself. Instead of strictly religions design, you could walk an alternate path and have something modern and beautiful which reflects colorful ideas. Get some drawings done by a professional, something that will be bright and appeal to you.
For instance, you can have rainbows with your child’s name or photo in it. You can have many religious symbols too, but in a different way. You can mash them together and create a beautiful picture. Or else you could use something like a chalice and use small chalice images and design your child’s name with it. You want to be unique with communion invitation here so get creative and bold.
After all, your modern first communion invitations aren’t going to consist of a single page. You are making a multi-page invitation design here. So bookmarks are a great way for people to access different pages, even if they aren’t all that necessary. You are just adding some visual enhancements here.
You can have your child’s photo or a bible or something else on the bookmark that would make it different from the usual fare. You can go a step further here and have different photos for different bookmarks. Each photo will correspond to a page depicting different years of your child. This will serve to make your communion invitations a bit more inviting for those receiving them.
Another idea for making invitations for the first communion supplies is to get your child to draw a simple picture or painting. You can then print it out and use them in the invitations. If possible, ask your child to make 3-4 small paintings. You can embed these paintings in the invitation. People receiving the invitations will be intrigued and will want to meet the child who has drawn the pictures.
If you child is not willing to draw some pictures, you could jump into the act and do it yourself. You will of course have different ideas, but they will definitely give a personal touch. You may even draw a simple picture of your own child and paint a bit to be used on the invitations. If you find this task too daunting, you may ask someone else who is willing to do it.
I have given you only a few ideas here for modern first communion invitations. If you put some effort into designing the communion invitations, you will have many more ideas that will make the invitations look better and more desirable than what others come up with.