How to group multiple blocks into one big block I have a website with Drupal 7 and the customer just asked to make it "responsive design".

I need, for the design to respond correctly, to group some blocks I already have into some bigger blocks, on which i can apply the specific classes I need.

Region aren't valid for me because the website is already built and it would be really messy to change it just to add regions.

Any ideas?

Thanks
Block Group module may help you


  This module extends the standard drupal block system with block
  groups. Each block group provides a new block as well as a
  corresponding region. Child blocks can be moved into any group region.
  The position and the settings of the parent block are propagated to
  its children. Also block groups are nestable.


Take a look. I am not sure how it will integrate with responsive style.