I am working for a company (www.isbel.com) that wants to change the blog theme only to look something like http://www.bumble.com whilst keeping the website template (theme x) as is. Is this possible?
Yes, sure you can make modification with CSS but if you want to change core files (depth modification) it would be outside the scope of our support. Please let us know which parts you want to replicate, maybe we could help you with modification.