Actually it's as easy as pie to pay compliments to people! You give them pleasure and raise their spirits! It can become for a person, you paid compliment to, the most pleasant moment of the day! And be sure, people will reciprocate your good attitude to them, your kindness!
But remember: compliments should be sincere, don't flatter! When flattering you will just make a person feel scornful towards you... So, look closely at the person and find in him something good, that can be really complimented, that you like about him!
Treat people friendly and be open towards them! In some time you will receive the same!!!