Picture Style Tutorial - Excellent tutorial on using custom pictures styles.
How to increase the dynamic range of your Canon 7D - All Canon DSLRS tbf (this video shows you how to get custom picture styles on your DSLR)
Picture styles based on film stocks - great for stills but a bit extreme for video
What I'm currently using for video. There is a version for low contrast scenes, one for high contrast scenes, and another which apes the gamma curves of a Panavision Digital film camera.
How to get custom picture styles to work in Video Mode
If you loaded your preset in stills mode already then you it is done, you just have to find it and just have to do this:
You have to remember when you were still mode if you loaded it in user define 1,2 or 3, let say you loaded in user define 3, then:
1. Turn the dial to video mode.
2. Push the menu button, scroll to picture style and push the enter button
3. Push the arrow up and down until you get to USER DEFINE 3
4. Push the DISP. button
5. Push up and down until the red square box is on Picture Style.
6. Push enter button.
7. Push up and down until you see your preset, and that is it.
Thanks to Soma