Petal boxes

Favor box via Martha Stewart weddings.

Another favor idea that also serves as table decoration. Create these petal boxes out of the paper of your choice, then arrange them in the center of the table.  They can be prepared in advance and they'll save you the money and work of arranging flowers, setting candles etc. 

Bright table decor

A friend of mine sent this picture from a wedding she recently attended. They used bright colored ribbon to decorate the table. It's a super inexpensive way to decorate and adds a lot of color. Nice and simple.