Ask your wedding coordinator for photos of past ceremonies to get some ideas, and brainstorm with your bridal party for more great ideas that you otherwise may not have come up with on your own.
You can also sit down with Search Engine Optimization tools like Keyword Discovery or WordTracker to brainstorm up new domain names with potential for good traffic right out of the gate.
Otherwise, break into teams of two or more (depending on the size of your family) and have the teams brainstorm ideas and write them on slips of paper to challenge the others.
If you want to create a custom statement, be sure to visit a reputable tattooist early in the design process and have them brainstorm your ideas with their own creativity.
When you find the prom themes your committee likes best, take a moment to brainstorm invitations, dress code, decorations, music, and menu to see which one you want to create into your magical prom night.