I have always done this design in white letters on a black background. I have also done buttons where I have scanned a photograph of the birthday boy or girl when they were just a child and then placed any desired text on the button. I even did one birthday for a beloved family pet, a golden retriever, who was getting very old and near death. Non profit organizations can be another good group to pursue. We've made buttons for the American Cancer Association, Humane Society, Red Cross, Girl Scouts and Boy Scouts, just to name a few.
Family reunions are another group that can use buttons.
I've come up with several basic designs for family reunions. Governments are another group that can use lots of buttons. The State of Arizona has been one of our largest clients and we have regularly made buttons for our Department of Transportation, Department of Revenue, Governor's Office of Highway Safety, and Department of Administration. The husband of one of our best customers just retired after twenty three years of working for the same company. My client later told me that her husband and everyone at work had a great time with that button at the retirement party.