Are there any resources which describe FLT in a very tangible way which will motivate students to be interested in this subject?
I don't know about any texts that will address this specifically (I'm not a number theorist) but on the other hand you could introduce the subject by teaching proofs for specific integer powers. Here is a good start on that.
-Dan
Here is a good webpage.
At the bottom of that page there is collection external links.