I'm getting married in October and I'm so stressed out. My colors are black and white with splashes of red. We're on a very, VERY tight budget so we're wanting to do a lot of the decor ourselves, but we want it to look nice. Any ideas?

Please help! I'm losing my mind.

My wedding is also in October. I went to Hobby Lobby Sat. and got several fall things for 80% off. Now is the time to get fall items.

Talk to moms who've done weddings for 2 or 3 of their kids, talk to married friends etc. They can tell you what stores in your area have the best prices.
Borrow anything you possibly can! Call everyone you know and ask for their help! You'd be surprised to find what people have lying around unused and would be willing to lend you.
I'm actually a teenager but my mom and I have helped with a lot of wedding receptions and we're masters and making it lovely and quite inexpensive. This one woman bought lots of nice tablecloths for her daughter's reception, and we borrow from her every time...there's stuff like that, that you can easily borrow instead of spending money on it when you're really not going to use it again.
I'm a fan of using Christmas lights as part of the decoration.
If you're religious and have a bond with members of your church/religion, lots of the women and maybe some teenagers would be willing to help out. And you can always get friends and friends' moms.
Teenagers can be servers and regulate all that sort of stuff, and women can work on the food and managing dish washing etc. You can get a few women you know and really trust to work on food - give them a menu and directions etc, and they can make it themselves or buy some of it.
Always make sure you have a cleanup crew, and people that are responsible for returning any borrowed items.
Around here (Northern Virginia) we go to Costco for good cheap roses. However they're sometimes tight/unopened - if you want wide/opened roses, you can buy these anyways and just set them out in the sun for a little bit. That will open them up.

Seriously, feel free to email me at frecklejellybean@yahoo.com with specific questions, especially because I don't know many details so you could give me some better perspective/idea of what you're working with. I didn't really give you much to work with in this answer because I don't know if you're talking about the wedding, reception, both...outdoors, in a church, in a rented place...ETC.
Best of luck and congratulations!!!!

I'd recommend anyone who is having trouble with their wedding planning to grab a copy of Amazing Wedding Planning. That guide was a lifesaver for me...especially because I didn't have a clue how to decorate for a wedding, and I was on a small budget. Get more info in my sig below.