CSS Generators - Thoughts please

I literaly have just fallen deep into the world of CSS generators. Just finishing of a site and i was trying to figure out how i could improve upon it. The CSS i used is just basic stuff really. So decided to try and see if i could jazz up my Nav bar with some fancy buttons. I then stumbled upon plethora of sites that do it for you so to speak. You ad what ever specifications you want to the buttons or just take already made ones and use them in your project. So i was wondering whether using these kind of sites is cheating ? Do i or should i learn how to do this kind of stuff like CSS animations, gradients, creating menus, and leave the generating sites alone.

I understand how it can improve on time taken doing each of those tasks but still feel kinda like im cheating by using them.

From my background which is music production, if i sample a song and use certain parts of it to make a new song, its allowed as long as i do no release the song. Due to copyright issues. Bit of a crap comparison but hopefully you guys understand what i am getting at.