Excuse the crappyness of my animation too, because I have lost a huge amount of skill in pivot.
Anyway.
Here is the animation I am going to use as an example:

There are 3 things I would like to teach you about this animation.
[SIZE="3"]1): Animating first. [/SIZE]
- You don't have to, but sometimes on short animations like this, I choose the animate the stickfigure first & add the background in later. So I can see the onion skin. It's not always useful if you plan to do a large animation. But it's useful if you're not in the swing of animation without an onion skin.
[SIZE="3"]2): Fast Moving backgrounds.[/SIZE]
- This is the easyest to achieve.
All you need is a .stk from somewhere like droidz, or if you're experienced enoug in creating them, make one. this always adds a nice touch to an animation.
In my animation the midget.stk is running through what appears to be a derilict city.

- When adding in the background.stk I decided to randomly place it so that it looked different each frame. This may sound stupid but at 17 fps (average .gif speed) random images of the same dimensions & on the same horizontal level in the background, can create the illusion for a fast moving object in the foreground.
[SIZE="3"]1): Eased backgrounds. [/SIZE]
- Remember when animating background sticks, you have to think that closer objects move more than the objects background. Not by a noticle difference though.

- Animation of backgrounds is very simple, easier then animating a stick figure moving, becuase there is a lot less to think about.
There we have it. Simple introduction to moving backgrounds. you can also add things moving past in the foreground, and add much more colours to your background.
Oh Yeah & 1 more thing, a lot of backgrounds have a fill stick and an outline stick. It's important to get layers correct. Always have the fill at the back, the outline on top of that and then the stickfigure at the front, otherwise your animation will look wierd due to a mix up illusion of forground & background stick figures.
/end