Go to ourblogtemplates.com for either free templates or instructions on how to design from scratch, or modify an exisiting, blogger template.
I run one of their templates on my blog and it is the best I have yet found. No dodgy links tucked away in the code and no images stuck in accounts you have to pay to upgrade after a couple of weeks. But you won't get catergories and tags as with WordPress.com as Blogger is only set up to allow labels (catergories). It is one of its downsides.