Just curious, why are we still using power of 2 sizes for tiles? I can imagine there used to be constraints by the hardware, but it shouldn't be a problem anymore nowadays.
It's still a problem on many platforms. Textures for a lot of things have to be in multiples of two before they're fed for rendering. That's how the graphics libraries are wired up. You don't have to worry about this sort of thing in Flash, but it's an issue you have to work around elsewhere.
Indeed. The BGE will blurrily stretch textures if they're not of power-of-2 sizes. Not that big of a deal, but yeah, it still matters.
Obviously. I have been working on my engine and game for about 1.5 years. We are to a point where we are starting to work on artwork. I was just purely curious about the sizes that people generally stick around for their characters.
My current project uses 16x16 character sprites, though I want to aim for larger sprites for more detail for other projects.