While I'm not the most pious christian, I do have a love for tradition. And I have a thing or two to say about that night and some of the people there (I was also at Sveti Sedmochislenici).
First of all there were too many candle sellers (and I already dislike the church for the candle business). I can understand a few men or women doing that, as not everyone buys their candles 1-2 days in advance. But I passed eight "vendors" just at the corner of the small park where I entered. And all but one were (sorry if I sound a bit hater-ish) fat, smelly, dirty and of the gypsy persuasion. Cheap sweat-soaked sports clothes, one hand in the pocket, as if they're selling a stolen cellphone... I'm sure they have no idea what's all the commotion about, except the part that they can make a profit.
Then there were the beer-drinking groups of youngsters (though I could be younger than some of them, come to think of it). I bet they were here just because they usually drink beer in that park. Drinking in parks was recently prohibited by law and here they are doing it on Easter and right next to the Ministry of Interior - the big white-ish building that has two lions and is full of cops. OK, policemen would have spoiled the festivities, but this just wasn't the time and place for drinking beer by the litre.
Bah, I think I should continue on a more positive note :) So here's what I know of this tradition. Around midnight the priest comes out of the church with the Holy Fire. The Fire is then spread to the candles of the people there (and that's when and how one is supposed to light their candle), which spread it to other people and so on, until everyone's candle is lit. Then the priest talks about the Resurrection. This year he made a funny comment that "Happiness should not end with the hitting of the eggs and the mosaic that is left on the ground afterwards". But I gather up the pieces of the shell of my egg in the cup (empty cup from кисело мляко, with a small hole in the bottom for the candle. Very practical, keeps the wind from blowing it out and the wax from dripping on your hands). After the "Hristos voskrese" part comes the going around the chirch three times, counterclockwise. As far as I know, this symbolises Christ's way to Golgotha, just as on Thursday the priests circle the church in the same manner, carrying a cross. After that everyone brings their candles, i.e. the Holy Fire, home, where it is left to burn out (yes, if it goes out on the way, God doesn't like you very much :P). Or light another candle, if you wish. I think it's also supposed to be brought to every room to light it up.
As for the eggs, the red one symbolizes the blood of Christ and the first painted (btw, that is done on Thursday or Saturday, as you're not supposed to work on Friday) egg is always red. There are many stories about the origin of the tradition, but what I've been told as a kid is that a woman carrying a basket of eggs went under Christ's cross and some of his blood dripped on the eggs and made them red. The napkins you saw covering the eggs may work both ways. After me and my baba dye the ggs and they dry off, we take some cotton and apply a li-i-ittle oil to make them shinier. Works very well, especially since egg dyes are getting worse every year. So are the bougth kozunaks, that's why I make my own. With a looot of filling :)
Also, you shouldn't use "Vesel Velikden". It's just a translation of the English "Happy Easter" (the guy who made the postcard apparently doesn't know or doesn't like Bulgarian) and there is no such greeting in Bulgarian (just as the label "Годен до" (edible before) on products is replaced by "Най-добър до" (best before) which makes little sense in Bulgarian). The correct greeting on this holiday is just "Христос воскресе" and the response "Воистина воскресе". And sometimes you may hear "Честито Рождество Христово". There's no such thing as "Весел Великден".
Oh, btw, you may have figured it out by now, but pigs and chickens don't go oink-oink and cluck-cluck, but rather gruh-gruh and kudkudyak (hens) and kukurigoo (roosters) :)
Hm... that's it, I think. Sorry for the negative parts (blush). I'm just in that kind of mood. I come home from a heavy metal concert - I'm fine. I come home from church - I almost break my ankle. Someone's trying to tell me something :P