Fremont Street (the original Las Vegas Strip) and its surrounds are a favorite. Old casinos, buildings of days gone by, plenty of cool art murals, grungy backstreets/alleys. Have your wedding on the street at plenty of cool little spots.
All packages can be customized to suit you - remove some things you don't need for a discount, or add something you need. It's your elopement, you should do it your way.
In the middle of the desert, the Nelson Ghost Town is a brings history to life. An impressive collection of antique cars, busses and even a plane crash, not to mention the "Little House on the Prairie" style wooden chapel. An hour's drive.