I may disagree with a lot about weddings, but it does seem to be the last great social shindig for normal folk (I say "normal" because watching watching Revenge has taught me not normal people seem to have formal shindigs for just about everything). In order to live vicariously through someone else's really expensive theme party, I got into making invitations. Like, really into it. So, without further rambling...
Lord of the Rings:
One love to rule them all, amirite? (I could only fit so many puns into the set itself, but I could keep going...)
I may have stolen this idea. When my older brother got married (the sibling who took the "natural-ability-to-draw" gene) he drew an homage to this comic cover. Ever since, I have been mulling over the comic book invitation. This invite originally began as a cover, but eventually it progressed into a last page/cliffhanger comic scene. It may be fitting since "Save the dates" are sort of cliffhangers themselves (all the "dropped a bomb" excitement with no information and months in between when anything new happens).

Finally:
What began as "steam" gradually turned into something of a World's Fair/turn of the century idea. This is still a work in progress, so something of the steam variety might turn up, but currently, I am in no mood to draw gears.
I think a space theme will certainly be next. In the meantime, I will be fishing around my pool of geeky love puns to help me choose between Star Trek, Star Wars and Doctor Who. Then again, I might just put it to a vote. Then again, I might just go with video games instead...Regardless, I am open to suggestions.