Hey! Launchers are a great way to further customize your android device to cater to your whims. There are many great launchers out there, some that are better than others for some, and some that are not. Some of my most highly recommended launchers include:
Nova Launcher- This is the launcher that I primarily use above all others. It allows you to resize your grid, overlap widgets, hide status/dock bar, change the icons, almost anything you could really want, really. It is fast, and the transitions are smooth.
Smart Launcher- This is the first launcher to categorize the app drawer into sections; tools, media, etc. It it a single page launcher with a "flower", or circle with your favorite apps. It is a very simplistic launcher, and the pro version has widget support.
Buzz Launcher- This launcher is great for the beginner. It has preinstalled homepage themes that you can download and apply, and there is a media setup that allows other Buzz Launcher users to upload their setups for your own use. It is still in Beta, so it might have a few kinks, but it is a great launcher with wonderful potential.
Lightening Launcher- I would recommend this one for a more experienced user. It allows for free range app and widget placement, rotations, and has a ton of stellar affects.