My friend is getting married and wants to wear a red wedding dress. Since I had a Christmas wedding, I had also had a red wedding dress. But her plan was to get married in March. I think it's great either way, but I was just wondering if it there was a rule as to what colors to wear for what season or if those rules even matter anymore?

Although I take no issue to a non-virgin bride wearing the white dress, nowadays it's just a fackin dress, no real reason to care that much about what the color means.
I know a bride who wore a bronze coloured one to a June wedding. All of the other weddings I've been to, the dress worn was white.
I Googled images of traditional western wedding dresses in red, because I was struggling to imagine it. They looked absolutely fantastic. If my bride was wearing this:
http://www.925-silver-shop.com/UploadFiles/2011-04/admin/201104222110153873.jpg
...my eyes would pop out on stalks!
See, I'm conflicted, I can wear a white wedding gown, and its symbolic meaning will not be lost by me doing so, and I really want to wear a white gown. But, I want to wear a red wedding gown really bad too. Something that looks a little more Victorian, though. I have a design that I'm working on, and I'm very happy with it thus far. Plus, I am taking sewing classes this winter {hopefully}, I'll be able to make the dress just as I imagine it in my head. ::D
You could wear two gowns, you know. A white one for the wedding itself, with all the symbolism that goes along with that, and then a red gown for the reception that shows that your period of saving yourself has come to an end and you're entering a new stage of your life as a frisky Spacey. ::P
Have you seen anything online that looks like what you want? Hmm, look at me being all girlish and talking wedding dresses with Spacey. Next thing you know, I'll want to be a bridesmaid. ::P
This is really bringing out my girlie side. I'm almost squeaking with delight here. :D
When is your special day, by the way? It can't be much more than a week away now.
Also, IIN cut off the rest of my post for some reason. I said that I really love the satin pick ups on that dress (heavy or not), and that the dropped waist is really lovely and flattering. I tried on some dresses with a similar structure and material, which is how I know it's heavy. I could barely stand in one. I'm a huge sucker for ball gowns. I'm a little concerned about the fact that the beading goes under the armpit, though, as that can be itchy or painful if the beads aren't smooth. If you look here, those little crystal beads look sharp as hell: http://vivifypicture.com/wp-content/uploads/2010/08/Deep-Red-Wedding-Dresses-Picture-3.jpg There are ways to fix that, though, like adding lace over that section.
I'll be wearing this dress: http://www.morileewedding.com/voyage-6508-mori-lee-wedding-dress/
I won't be wearing the belt, though, as it needlessly breaks up the body. I think the intent is to bring attention to the smallest part of the waist, but it ends up shortening the torso.
If I'd gotten a red dress, I think I would have gone with something with black accents, maybe some black lace, if I could find one, because I think that would feel less prom-ish. A dark red with ivory accents would work, too, but I wouldn't want bright white or diamond white accents. I can't picture how that could turn out any way other than awful.
Dammit, dappled, now I'm looking at dresses again. YOU DID THIS, DAPPLED. THIS IS YOUR FAULT.