Gears, cogs, wheels and other machinery are THE basis of steampunk, including watch faces and parts. These components should be used everywhere in the bouquet and jewelry, escort cards, table numbers, toasting flutes, serving set, on the cake and more. Pipe assemblages and other industrial-looking parts are also welcome to achieve steampunk wedding bliss, especially in centerpieces. Some personal favorite details are large white clock faces beneath clear plates for place settings, pocket watches or large keys as escort cards and favors, clocks indicating the hour as table numbers, bike gears as coasters and a plethora of Edison bulbs (filament lights) hanging over tables from black or bronze-colored cord at various lengths.
Actual machines and forms of vintage transportation are welcome, too, including mini zeppelins, hot air balloons and I've even seen a vintage flying machine hanging above the reception area. Paper lanterns or regular helium balloons are great for creating mini hot air balloons. Plus, how cool would it be to leave your wedding in an actual hot air balloon with "Just Married" bunting draped from the basket?!