Name of the app which shows colorful Android and sweets in grid Can someone help me what is the name of this app? I can't find the name of it. Is it a spyware?
It's not malicious - it's part of an "easter egg" hidden in Android 4.4. You can access it by going into Settings → About and tapping on the "Android Version" quickly 4-5 times. Here is a demonstration on YouTube.

There are also some third-party apps on the Play Store that attempt to extract these easter eggs into portable apps, or use them for boot animations or daydream animations. Whether or not those are malicious is difficult to determine definitively, but you could probably hazard something of a guess based on the permissions the app requests.

The easter eggs have been of varying levels of complexity and interactivity. Lollipop's is basically an Android-themed Flappy Bird clone.