If you want to cleanup OS X Launchpad and restore to default you can use OS X Terminal. The command resets the Launchpad with the default content sorted on a to z basis.
Launchpad uses a blurred version of your Desktop image as its background. Using cmd + option + ctrl + B while in Launchpad cycles through the original image, the blurred one, a black and white version and a blurred black and white version.
With the following defaults write command you can adjust the blur radius:
Launchpad shows a fade effect anytime it is opened or closed. If you want to access Launchpad a little bit faster, it’s possible to disable the fade effects. Use the following Terminal commands: