Get more and more visitor, improve PR and show your theme based business owner your blog. You can earn monthly income to put their banner ads.
Read this article Can Blogging Make Money? 5 Ways To Make Money Blogging Online It gives you 5 effective ways on how to make money online, you have enough traffic to be making money from things like affiliate marketing.
I would suggest, that posting unique articles on your blog will pull huge traffic. and once it reaches PR4 or higher..your website would be a good tool to advertise and earn money.