I wouldn't say that easy flourishes don't look cool. For me, a flourish doesn't have to be hard to look good. Beauty and difficulty are two different things... Sounds like you're learning from youtube and, maybe that's why you get the impression that easy flourishes don't look good, because a lot of beginner tutorials on there are really poorly explained and even the so called "teacher" can't do the flourish properly... You should definitely start by learning the basics from good sources... You could get a DVD like Genesis by Andrei Jikh, which teaches the basics, and I guarantee you you will see that flourishes can look great without being (too) hard, when performed well
Now, if you are a beginner, but don't want to spend too much money by buying a DVD, and still want to learn cool looking and useful moves, I would highly recommend checking out SchoolOfCardistry on Youtube. This channel truly has great, clear and well explained tutorials, by an awesome cardist: Jaspas.
The videos teach the basics, as well as some (usually not too hard) original moves by Jaspas.
Once you know the basics, take a look at the Wire, where you have a plenty of pretty awesome flourishes, and where you can choose between easy, medium and hard tutorials... From there, you'll become better and better, and be able to learn harder flourishes, or even create you own
My last tip would be not to try learning too much flourishes at the same time. That's a big mistake a lot of people do. When you learn something, learn it well, practice it a lot, till you can perform it smoothly, and THEN move on to another flourish... Also, you said that you learnt Flicker... Well Flicker is an awesome flourish, but in my opinion maybe not for a beginner... So, once again, learn the basics first and then move on to harder moves... That being said, the best way to progress is to have fun! Sooooo... Have fun with cardistry!