Making a background out of a background of an image?

[digifx]

Hi everyone!

I need some help into making a background out of the background of another image... I'll explain myself

From those 3 images:

http://www.willmurai.com/images/whatsyoflava_painting.jpg

http://www.willmurai.com/images/wyf_coffemilk.jpg

http://www.willmurai.com/images/wyf_strawberry.jpg

I'd like to put the 3 images into one using the background from http://www.willmurai.com/images/wyf_strawberry.jpg But I don't know how to "extract" the background and paste it as a mosaic (I've tried it but It does not look as a background, It looks as some images repeating because of the gradient).

Any help would be apreciated

Thanks in advance.