Erm...Sorry, but if you'd had an unique idea for your directory, would you share it and not do it just for you to get more promotion from it?
Here is a link to some creative ideas about how to change the DMOZ, but they could be applied to smaller directories as well. If you want more specific advice or ideas, you'll need to pay a consulting fee or come up with them yourself. There are a lot of great places for free information, good luck!!