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Can someone help me with a circuit?

hi
im planning to make a light bar out of rgb leds. the basic idea i have in mind is that there will be a row of 10 rgb leds. the circuit will have a variable resistance for each channel ie red,green,blue. by varying the intensity of each channel i will be able to produce different colors. 
now the major issue is how do i connect the leds in series or parallel,which will be better to use with variable resistance. and how should i make the circuit so that i have one variable resistance for each color which controls the intensity on all 10 leds 

Use three circuits like this one. Without an idea of teh forward volt drop of each colour, I can't say whether it will work on your LEDs

Leds MUST be connected in series.
trimmable current source.JPG
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