1. White tablecloths or colored tablecloths?
There's also the option of a white tablecloth with a colored overlay...
Or pintuck linens...
2. Chair covers or no chair covers? In other words, which is uglier, the venue's chairs, or the venues chairs covered with what is basically a big pillowcase?
If I won the lottery right now, I'd rent Chiavari chairs for the wedding. Look at these photos. The fancy chairs do make a difference. I'd also rent a man in a chef's hat.
3. Where to locate the buffet, cake table, etc.
I like this setup, with the cake being spotlighted against the green wall (we'll be projecting a monogram, too) and the food on a serpentine table (which is really just two curved tables).
Another option for food setup... obviously (unfortunately?) there will be no palm trees at my wedding.