Is there any free Wordpress theme that can be modified easily as per need?

Question by VENKATRAO B: Is there any free Wordpress theme that can be modified easily as per need?
Most of the free Wordpress themes are static ones as regards to background color, border color or font size, etc. Is there a theme that can be adjusted as per need like Blogger. In blogger, you can change background color and make many adjustments. I want a theme that fits in for a article blog where some adjustments can be made as regards to background color and header color so that it

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