Many people pick heart wedding invitations for their wedding theme. If you are thinking about using this as your wedding theme, be careful because you can easily find some very generic designs out there that have been over used. I would suggest trying to find something different that represents you and your spouse to be without being to cliché. You could have a special heart monogram designed just for you. This is definitely a good direction to go because you will know that it is unique and that most people will not have it.
It would be very easy to get carried away with the heart theme, because there are many different heart wedding items available to buy. What is important when developing a theme is creating a style. I would be good to ask oneself whether the item that is being added is helping create the style of detract from the style. There are many different types of hearts, and just because the item is a heart does not mean that is belongs in your wedding theme. Being specific about what you want and the mood that you want to create will make the job of creating an environment that reflects your desires easier.
There are many ways that a heart wedding invitation motif can be created. You could have something very elegant and simple created, or a pair of hearts that have embellishments on them that could be very ornate. You may decide that you really like the idea of candy and you may go with a candy valentine heart theme. The color palette should also be considered. Just because most hearts are red should not be the reason that this is in your color palette. The mood and style that is desired should be the priority when picking colors. The idea is that you think about what you want to achieve and find some hearts that work with your desired style.
Of course whatever style of heart wedding invites you decide to use, will go nicely with the idea of marriage. Marriage is after all the melding of two hearts together to become one.
I'm a graphic designer who has been working in the field for 7 years. I have recently graduated from the University of Houston. I have created many invitations for friends over the years including some wedding invitations. I really enjoy designing them, and am working on being able to supply them sometime in the future.