I have an idea. We already have Miniloader, which is based on modloader. Why not make minipatcher? It would allow you to make higher resolution texturepacks.

You can actually do that now, or at least try

I think that it might be a little harder than you would think. Most of the game is basically hardcoded to use the generic resolution.

Unlike Minecraft, Minicraft was never built to support changing texture packs. Although it can be done by adjusting the Icons.png file within the source code or jar, it's been programmed into the game that it,
1. Only supports about 3 colors per sprite.
2. It recognizes specific sections of that icons.png in its own format.

Basically if you really wanted to make it work better you would have to go into the deep files and tediously adjust everything so that it suits a completely different graphic color and spriting algorithm.

After that I suppose it wouldn't be too difficult, but you'd need a pretty smart programmer in java to figure some of that stuff out, as well as one who's willing to spend the time on it.

Ultimately you would have to make a pretty extensive mod to do that, not to mention there's the issue of compatibility with other mods as well.

Unless I'm completely in correct in which case the pro's around here are free to slap me as many times as they wish with any hilarious object they can think of.

Minicraft Textures now works like that. It is on PlayMinicraft and is signed. Once David writes his guide we will start letting people make their own texture packs for it.