Here is a beautiful boot animation ripped from Lenovo K800. It has packed into a mtz and should run on MIUI GB (not tested) and ICS ROMs both. The boot animation is available in two sizes for the devices with 480p and 720 p screen.
Download the Lenovo K800 Bootanimation.mtz (applicable version) file from the link below and copy it to MIUI/Theme folder on your device’s SD Card. Open Themes app from desktop, tap on Mixed tab, select Bootanimation option and apply theLenovo K800 bootanimation from here.