Grumpy_Mike:
do any other colors other than R, G, B, white and black would make the project significantly more comple
No you get the secondary colours as well just as easy.
Mind you those black LED are cutting edge, there are currently avaliable in three shades of black as well.
Sorry, forgot to mention "or 100% combination thereof". Glad to see the picky police are here to "help".
IR LEDs are kind of like black LEDs, and they do come in different shades 
Tim