To all and FInixNOver.
I think I need to give a warning. I strongly advise NOT to touch the notify.dll and notify.dll.0409.mui which FInixNOver stated is responsible for the bell/notify icon. I believe it is windows native icon. I tried to change it to a more colorful one and ended up crashing the phone VERY BADLY. So bad that it attempted to boot up itself and failed for like 10 times and finally it gave up and told me (yes, there's a black screen with words) that I have done something wrong and it had to erase the ROM and reinstall everything again. It didn't manage to reinstall "everything". TF3D was gone and it just gave me the Today screen with virtually nothing (no program, can't go to settings, can't sync, no network detectable even with sim card in). VERY LUCKILY, it didn't attempt to erase the internal harddrive and I happened to have a cooked ROM .nbh file there. So, I had no choice but to flash the phone from the internal harddrive. If I hadn't the .nbh file on the phone, my phone would be something close to a brick.
Yes, yes, I know I should be prepared for such kind of disaster. I just write this down to remind myself :) as I believe I almost bricked the phone.