A free app for Android, by AppLock.

Personalize your device and make it stand out from the rest with this unique AppLock Theme Microphone app for Android. This application offers a music phone theme perfect for music lovers out there.

It can change the look of your lockscreen and the dots used to enter your pattern password. Aside from the purple music theme, this app also has other options that can beautify your device: suit, farm, penguin by the beach, sunflower, pink hearts, rainbow, and moon.

Note that the AppLock Theme Microphone app needs AppLock v2.16+ to function. Make sure you have that app installed before using this one to change the theme of your device.