Custom Boot Logs for iPhone, iPod and iPad were made available through the recent release by the iPhone Dev Team, since the Apple logo is quite boring. If you are already jailbroken via Redsn0w 0.9.6rc9, simply rerun Redsn0w 0.9.6rc11 over your existing jailbreak and mark the "Allow boot animation".
Here is a video of it in action:
Official change log for redsn0w 0.9.6rc11:
Those running redsn0w may have noticed we enabled too many Settings options in some versions of the jailbreak (for instance, what you want your side switch to do, even if you have no side switch because you’re not using an iPad). Release rc10 of redsn0w corrects that (you can just run it over your existing jailbreak…be sure to de-select Cydia to avoid package conflicts).Follow us @iPadJailbroken or join our Facebook page to keep updated on all the latest jailbreak information for your iPad.
Along the way, we’ve also added the option to enable boot animations…these animations can be installed via Cydia, but be sure to select which animation to use via the Settings->Bootlogo setting after you’ve downloaded an animation (and again, you can just run rc10 rc11 over your existing jailbreak…be sure to de-select Cydia to avoid package conflicts).
(The boot animation we tested against was “Android Boot Logo”. It correctly installs all the dependencies needed to run the animation at each boot).