The Lumos jailbreak tweak, developed by CP Digital Darkroom, adds a new icon on your lockscreen to quickly enable the flashlight. No more do you have to launch the Control Center to turn on the flashlight. After you have installed the tweak, you can customize it to your liking by going to Settings>Lumos. Here you can select between two flashlight button styles, and you can also adjust the position and opacity of the button. See the screenshots below for examples.
If you want to give the Lumos tweak a try, it is available from the default BigBoss repo for free. It does require that you have iOS 7 installed.