Well i would definitely go with what the other people have said, as that's the way to go if you want a crazy looking one!
but .. there is always another way.
first of, i recommend go check out my outro, which is my channel trailer. it's not to promote my own channel or anything, but it's an example of what i was able to accomplish, with a bit of creative work, and plugin research.
what i did was, i found a picture with the vault boy, which i like to use as a "mascot" for my channel, or just have him shown around the place. then i figured out that i wanted to have some kind of place that would show links to my other videos, and what else people should check out. that i managed by finding a plugin for my video editing program (cyberlink powerdirector 11), which i then customized a bit to fit my needs. then i added a cool and fun little talking bubble to the vault boy, just to add a bit more fun and some more customization to the outro.
this is how i made mine, and how you could make yours if you don't have the resources to get your hands on After Effects, or the needed skill set to make a unique 3d animated outro

if you want more help from it, on how i did it, and how you could do it, just message me, and i'll help you out anytime!
