Here are some options which allow you to include a daily quote on your blog.Brainy quote provides a cut and paste script for 5 different daily quote types:
Brainy quotes also provides the code to include RSS feeds of each of these quote types.
Todays-Woman famous woman's quote of the day.
A wordpress quote plug-in can be found here Adding Quotes As Customizable Content
Quogr - is a free tool, for blogs using their own server, that allows you to display random quotes and images of your choice on your site. This tool creates a database of your favorite quotes and images and generates an html tag to embed on your website. They call this a quog!
Try to find a quote of the day that suits the mood or topic of your blog.
You may even decide a different type of quote more suitable - ie stock quotes. Yahoo provides a service that creates a customisable script for you to include on your site showing stock quotes charts and news.