Mixing light sources and temperatures to create something different - Advice appreciated!!

Generally mixing light temperatures just leads to either one of the light sources looking yellow, or one of the light sources looking blue.
However, what can work well, is using colored gels with studio strobes.

You may also want to explore the following tool that I noticed recently:
http://www.calumetphoto.com/item/CF1001/?ctc=Calumet_US-Homepage-Aspots_1-CF1001

I was actually planning on using continous lighting for this series of photos as I am due to start working as a lighting cameraman soon on a few short films and want to get used to working without strobes. I was hoping that maybe someone here would be able to guide me a little as to what to do and what not to do when mixing color temperatures and so on. What works well? Are there problems that I should look out for? Are there particular light ratios that work really well? etc.... Any help would be great!

Below are 2 photos that I found on flickr in a matter of seconds that give a slight idea as to the direction I'd like to head. I am not saying that these photos are incredibly lit and am not concerned about the composition, it is the atmosphere and color that I am interested in.
http://www.flickr.com/photos/tenovertwelve/3289242788/

http://www.flickr.com/photos/gavingoodman/268669476/

Color tend to bleed into one another unless you control where they go. I did this one at a local machine shop where the project was to try to show the heat and power involved in an molten aluminum pour into a rammed sand mold for an industrial part. Using four strobes with no filtration would have just been simple clean light, but not much emotion. Using four small strobes, each with a different colored gel and deciding way ahead of time where each would be directed took care of the bleeding.

John,
The two examples you posted were cross-processed to get the color, not mixed light sources. If you want different colors in your shot from mixing light sources, you have to decide which one to balance to first. If you balance to daylight, your tungsten will be yellow/orange, and if you balance to tungsten your daylight will be blue. That's all there really is to it unless you are going to gel the lights for color. I guess I don't fully understand what you are after...

Film was good in lots of ways for mixed sources effects, but you will probably have better results in digital if you turn off the automatic white balance. AWB does too good a job in most cases for the dominant source to make really striking mixtures of various light sources.

mixing color temperatures and so on. What works well? Are there problems that I should look out for?

Figuring out what 5500K + 3300K= is not really a problem as this is simply a color mixing ratio. Your difficulty will be (controlling) where the light strikes. Using gels as mentioned is doing the same thing as you are changing the color/temp of light.

Directing 3200K @ f/8 PLUS 5500K @ f/4 will produce some pretty wild color shifts. So you are not only dealing with color temp, but also a ratio of one color compared to another.

Ex: Let's say you are directing some flash (5500K) to your subject. You also direct another light onto the subject (2500K). Where the two different color temps overlap will no doubt look pretty whacky.
If you can reproduce such a lighting setup given the infinite possibilities, more power to ya.

There has been some experimentation in this area, but nothing I can point to as a step by step.

I have on many occasions, lit my subject with flash (Primary) while the background was bathed with multi-color incandescent light. The background was composed of various colored panels/shapes which obviously change color depending on what color light was impinging on them and at what intensity and light shape.

While there is nothing new about what I do, you'll find this same technique used often in cinematography. It gives us photographers some really interesting backgrounds rather than the same old boring black, white and grey.