Just before deleting the blog, I tried reverting to the original theme 'background image' and it wasn't available under these options either....so deleting seemed the fastest solution..
Deleting a blog is never a solution to anything you experience.
All you had to do was to remove the color here > Appearance > Background and the Matala graphics would have appeared again.
sibcherry.wordpress.com is no longer available.
The authors have deleted this site.
Deleted blog URLs are not recycled, regardless of who registered and deleted them and no exceptions are made.
To prevent accidental or inadvertent deletion of blogs, there are multiple warnings given that blog deletion is permanent. Lastly, a verification link is sent in an email and must be clicked to delete a blog. http://en.support.wordpress.com/delete-site/
You can register another blog with a similar name. http://en.support.wordpress.com/register-a-blog/
Or you can register a domain via a domain mapping upgrade and it will not matter what the underlying .wordpress.com address is.