Hello. I did a engagement cake with edible images of the couple. I made it look like scrapbook pages with pics of their relationship from the very begining right up to the pics of when he asked her to marry him. I cannot get my scanner and my computer to get along right now. That's why I don't have pics yet. Sorry.
what about something related to how they got together, the proposal, a thing they do together-something unique to the couple?
Or could you tell the brillant people here these things and they could come up with amazing cake idea, I know from reading the foums here daily atht they do it all the time 
i'm doing a cake right now that could be used as an engagement idea. although mine is for their wedding reception when they return to the states, i based it around their engagement. they got engaged while on a picnic in a park, and the theme of the reception is "chuckwagon bbq". i'm making a 16" round with grass and a road with a fork on the end. there will be a covered wagon and him and her sitting on a blanket under a tree resting. i plan on putting road signs in the fork of the road, with names of nearby towns like "marital bliss", "kiddy lane", "hard work", etc...
you could always change the wagon to a different type of transportation, maybe even the automobile the couple drives...
just some thoughts., hope it helps
http://www.cakecentral.com/modules.php?name=coppermine&file=thumbnails&meta=search&type=full&search=Engagement
There is a link to the gallery for all the cakes under engagement. Hope this helps!
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