(Warning: longer than it should be!)
I haven't read all of the replies, so forgive me if I repeat anything
*We used very few flowers. My bouquet was made of white and green carnations, which I put together the morning of the ceremony. The only other flowers we used were irises from the yard. Those were given to our mothers and grandmothers during the ceremony. Total: <$15
*We made our own cake. 3-layer, columns, all of that. We really didn't need such a big thing, and I wish we has just kept it at 2 layers. We could have made a 2-layer one for probably $30. The biggest thing to get "the professional look" is to freeze the cake before icing it, so that little flecks of cake don't get into the white frosting. The was especially true for us, since we colored our cake emerald green.
Total: about $50 and a lot of time. Trust me and don't try the 3rd layer.
*For the cake topper, we chose one of those Willow Tree figures. It actually looks nice on the shelf at home, and fit our theme better than a white-plastic-and-lace thing.
*We got married at my aunt's house, on her deck in March. All of our ceremony decorations (a white metal arch and a lattice backdrop) were borrowed. For the receptions (indoors), we borrowed 3 tables and white tablecloths (borrowing was the key, lol). The central table was for the cake, another was for the punch, snacks, and favors, and the 3rd was filled with photos of us. My aunt also decorated her fireplace mantle, and total indoors I think we spent maybe $20, mostly on white candles. The rest of the decorations were photos we already owned (in our own or borrowed frames) and small items my grandmother lent us (like green glass candleholders she had received for her wedding 50 years ago).
*I did buy a dress that was way too expensive. Originally, I had bought a white prom dress on clearance ($20), but it barely fit when I bought it, and then I gained about 5 lbs. It was enough weight to make the dress fit poorly, and I ended up spending (eek!) $350 on a dress. It was totally not worth it, and my biggest regret about the entire thing.
*Tuxes seemed too formal for us, so DH wore dress pants and a homemade shirt. It was made with a man's dress shirt pattern, but we added turned-back cuffs and his grandmother made a panel so that the buttons were hidden. It was made of crinkled white fabric trimmed in gold-and-green trim we bought online, worn untucked. I LOVED it.
Total cost (including shoes): about $60.
*We had an afternoon ceremony so no one expected a meal. We served cake, punch, ranch crackers (soup crackers flavored with ranch mix), and chocolates we melted and poured into themed molds. Molds can be bought on ebay for about $2-4 each. We used Celtic knots and Claddagh rings, but you could get flowers, doves, etc.
*Our rings are sterling silver. I have hated yellow gold since I was 12, and white gold was too pricey. We settled on silver, and I am so glad we did. I don't know why people assume wedding rings *must* be gold? There are a lot of "poesy" rings availible online, with love-sayings in Irish Gaelic, Latin, Hebrew, etc, which are meaningful and inexpensive. I love ours. Total cost: about $100 for both rings.
That's all I can think of right now... I think our wedding totaled about $1,000 including rings, dress, paying the officiant, purchasing books to help us write the ceremony, etc. I really wish I had just made a dress, and cut the guest list from 50 down to around 30. We could have easily squeezed by for $500 that way.