Blended Family Invitations

I am getting married this summer. This is my second marriage. I have two children from my first marriage. My fiance has a daughter. Their ages are 8, 7, and 5. We are planning a very special wedding ceremony with the theme of "yours, mine, and ours." I have found information on family medallions and also a song that is very appropriate. However, I am having a lot of problems finding invitations along this same theme. We have decided on the wording we will use, but we cannot find an invitation that allows us to have pics of the kids on the invitation. Does anybody have any suggestions of wedding suppliers who offer this type of invitation. I would prefer buying them rather than making them for a more professional look. We are on a very limited budget.