change category / subcategory layout of one page only

On most category pages of my site the subcategory thumbnails are arranaged in a grid (3 wide). However I have one page where I want to use wider subcategory images so I want to arrange them in a list (on this page only). Is this possible? If anyone is able to provide very specific instructions on how to do this it would be very much appreciated!

(alternatively, if I could restrict the space available for the thumbnail list / grid and force any that don't fit within this space to go on to a new line this would probably also do the trick - currently the second image is being placed beside the first which means it goes behind the the blocks on the right and off the screen). In this case it wouldn't matter if it were for this page only, or all category pages as the other pages all fit within the same space.