I have an RGB LED strip with 10 (common anode) RGB LEDs that I would like to have on a continuous loop for ambient lighting. They're the SMD type and they seem happy to take 5v but unfortunately I don't have any specific information on them because they're unbranded (and because I salvaged it from something else 
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Firstly, is it possible to control this LED strip with an ATtiny45 or ATtiny85? Also what components would I need to make it work - a few transistors maybe? Bear in mind it would be nice to have the ability to fade them with PWM.
Secondly, would I have any IO left to have a potentiometer which would change the overall brightness? This isn't a high priority but it would be nice.
Thanks 