As for eggs, for baking they can easily be replaced.

It's more difficult if you want to replace scrambled eggs or similar. I have tried the vegg [1], but have not been very impressed.

And I just googled and found out that apparently in China there is a food scandal where they produce fake eggs [2]. Obviously they design them for profit and not as a replacement for vegans or even a healthy, cheaper alternative. But it seems that it could be done.

[1] http://www.thevegg.com/ [2] http://newsfeed.time.com/2012/11/06/how-to-make-a-rotten-egg...