For over 37 years, Apple has been using the same "bitten" apple as their company logo. Sure, it's looked slightly different over the last couple of decades, from rainbow stripes to monochromatic colors, but its shape has change very little.
Since I'm constantly applying new themes and tweaks to my jailbroken iPhone, I see this logo every single time I respring. I love Apple, but there's only so many times I can look at that flat piece of fruit.
Luckily, the bootup logo can be changed very easily if you jailbreak your iPhone, and that white apple can be switched out with pretty much anything you want, including your favorite superhero emblem/symbol. It's a dead simple tweak, but just make sure to have WinterBoard installed first.
Aside from the two prerequisites above, you'll just need to open up Cydia, then search for and install SuperHero Bootlogos. The package includes famous DC Comics characters such as Batman, Flash, Green Lantern, Superman, Wonder Woman, and more.
After installing, open up WinterBoard, tap on Select Themes, choose your logo (only select one), hit Back, and then Respring.
When your device restarts, you'll see your new super boot animation. Here are just a few examples of what I tried out.
It's quick, painless, and makes your device even more super than it already is. You can now easily feel like one of the Justice League members! Well, sort of, minus the whole being-able-to-fly thing.
Original Batman-Superman logo via Warner Bros.