Perhaps you can change your Adsense title color to orange or light blue to blend in. I think your site looks pretty decent, however I would add a sidebar so they can view a variety of your famous quotes.
To be hones, the design is plain, the right column is hollow . But you have 21873 Quotes in your database, which I am interested in .
I kind of like it. For the content that is. The search feature is nice to. The Adsense is a little uglified but the rest is ok.