Simple, free PHP blog engine easy to redesign?

I am looking for a PHP blog engine which needs to be easy to redesign (CSS, HTML). It also needs to be free and have simple user interface so that the client doesn't struggle to add posts. Any suggestions?

Solution

Wordpress - I keep trying other blogs and I keep going back to wordpress. It's definitely the easiest I've used for customizing templates, and the admin UI is very nice.

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