DonMigs85
Member
Well for starters, the Nexus 5 comes with a stock launcher (the thing that shows the home screens and app launcher) that offers very basic customisability. Basically, all you can do is add/remove pages and widgets/apps. Downloading a 3rd party launcher from the Play Store can allow you to go even further. Customise grid sizes for the home screen to allow more things to fit, customise icon sizes and fonts, have folders in the app launcher and even tabs and so on. The best two 3rd party launchers are Apex Launcher and Nova Launcher, which both look very close to the stock launcher so you won't lose the basic visuality of it.
Apex Launcher hasn't been updated since August, though. I bugged the developer on Facebook last November 8 and all he said was "there will be future updates."