Favorite Lockscreen Replacements

Homescreens/Launchers are brought up often here, but I'm curious as to what lockscreen apps people are using.

What Lockscreen replacements do you guys prefer and why?

Usually, I stick with stock or widget locker. But lately I've been giving Cover a try and enjoying it quite a bit. I do wish there was some more customization to it though. (I'm sick of that included clock's font, and would love to be able to replace it)

So what are you guys using. I'm hoping to find some more obscure & unique lockscreen apps.