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yea you can mix those, problem is, most conveniently packaged driver IC's including the ones on page one control the cathode (connect and disconnect to ground) , and those led's linked are common cathode (all 3 led's in the package has ground are tied to 1 wire), to go that route you would need common anode ( one + leading to 3 independently controlled grounds)
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If your going to make your own solution from scratch, it doesnt matter... BUT if you want to use a driver IC almost all are setup to flip on and off the cathodes, and not the anodes, so you would need a common anode led in most situations
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super you just multiplied the complexity
3b) no it would be up to what you have driving the led's, for example...
looking around recently showed some maxium surface mount chips that could drive 2 arrays of 64 leds, and provided 4 levels of "brightness" so 6 of these jokers (at 8 bucks a peice, + smt board development) could run a 128x128 rgb array with upto 64 unique colors by themselves (4 ^3) the same could be achieved by 3 of the TLC5940 per bank of 16 rgb led's, depends on resources and scale I guess, with enough of both you could drive a 16.7 million color HD jumbo-tron if you wanted (in low draw resolution)
on the flip side, if you had a beefy power supply and a clever way to hook it up, you could make a 3'x3' "mood" table