Plugin ideas?

Alright, so I've been learning a fair amount of programming. I feel I now have the basics down, and over the course of Christmas winter break I hope to create a bukkit plugin. Although I haven't actually worked much with java, I've done a fair bit with c#, which is very similar to java. The only issue I have with my goal is I don't know what to create. So, I've come to you guys for ideas. What kind of plugin should I make(the simpler the better)?

Anti-lag plugin means You = God

There's only a few plugins out there that are like that, but they all don't really do that much. The issue is that Minecraft needs a fair amount of bandwidth. Cutting down on things start to affect gameplay. I can't lower the bandwidth without making minecraft do less, and there's only a few ways to do that. One of these is that it stacks groups of items. That makes less items on the ground which means less bandwidth used. Another is a bit more complicated and deals with how minecraft sends and loads the chunks.
Because there are already anti-lag plugins out there and I'm not that familiar with minecraft to the point where I can see obvious sources of lag, I don't think I'll be able to make an anti-lag plugin.

it would be epic if your made on like the one with the bunch of animals (like pegisis,etc...) but not as many animals like have goats or like....kangaroos!!! <----so genius

or you could make one that like umm....kinda like something like you can be a cop or an acrobat or somethin idk im just brainstorming here but yea stuff like that.

YOU COULD MAKE POCKETS OUT OF KANGAROOS AND EVEN KOALA'S! IT COULD INCREASE YOUR INVENTORY
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(Even moar genius)