Here:
Download it to your PC if you want and then open framework-res.apk file from /system/framework/ and then navigate to /assets/images/ folder!
Now check the .png image file's name! it should be "android-logo-mask.png" if it is that then you can move it to framework-res.apk /assets/images/ where is the android logo file with same name.. replace the file with this file and then you see JétDroid as the boot logo when you boot Android..
MDPI is recommended and JetPlatform 0.5 pre1 binary is MDPI (320X480 or smaller screen resolution..)