Well, I haz an idea. COLOUR THEM. MARKER PENS. SPRAY PAINT. WHATEVER. GOGOGO DIY.
Ok I think I'm trolling or something. But as you said they do stand out from the other cartridges you have when you have them in a pile. For convenience.
But what I think is the most important thing is what's in that gamepak/cartidge/card. The contents. If the game was really good then you wouldn't really mind much of the outer packaging, but even if the packaging looks nice when the content is crap, then it's useless.
For now the franchise is still in the state of the former, so I don't really mind. But it'll be good if they did something to the colour.
@Evolution: It might. Not to say that it's impossible, but now everything in existence now is a result of mass production technologies, plus the modelling technology used to make the plastic covering (and the tech bits inside) have improved tremendously over the decade, so I don't really think the costs would escalate too much. Maybe a teeny bit. (They produce in bulk too)
Well who knows the small game cards might have just costed about a couple of dollars (or even less)