hey guys!
can anyone tell me which framework do you use to create custom wordpress theme. I would not prefer creating wordpress themes from the scratch. I would like to customize the existing themes according to my preferences.
Thank you
It’s not really clear what you mean by framework. WP is complex enough without introducing more frameworks, IMHO. My suggestion would be to start with the default or classic WP theme as your starting point and modify it from there. But WP is not really my thing, so expect better replies. 
Believe it or not it’s easier to start from scratch.
Also you are missing a basic understanding of what a WP theme is; it itself IS a framework of CSS/ PHP and .js files + Graphic Design. If you are looking for a short cut you could take an existing theme, and use the WP editor to alter the graphics ( and possibly the layout) IN the CSS and, if necessary the PHP logic. Since you mention customizing and existing theme, working with a frame might necessitate that you recode the CSS , since chances are the original designer did not use the same CSS framework to create his /her layout