I had the chance to teach how to make backgrounds for cartoons, in Boxel Workshops, in Tijuana.
Here is a little background I've made to inroduce my students to the different steps and jobs concerning BGs, in a traditional way.

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(click to enlarge)

The point of this class is also to introduce the students to concept art, story-board, layout, clean, composition, colors, animated effects and compositing. I think it is important for them to learn to use as much traditional artistic skills as computer skills. So we're mixing both in this workshop.

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They've been making an awesome job!!! =)

see their work here