In web application, designing also has same importance as development because user interface matters. If UI is not user friendly then ultimately application won't be useful. Here i'll show you brand new theme installation on yii php framework.
First we need some template compatible with yii framework. I found two template link which is free Theme1 Theme2 download both templates from given links. After downloading complete follow the steps
Steps
1. First go to your yii app folder
where you've installed yii framework app( for installation read my
first blog installaiton)
2. Copy template folder and paste it
into the theme directory which exist in your app folder (/opt/lampp/htdocs/yiiapp/themes/)