Enhancing pictures taken from Cellphone Cameras

Hi Guys! I just want to know your thoughts and suggestions on how to enhance pictures that were taken using a Cellphone Camera. I know what you are thinking, you're probably going to tell me to get a decent digital camera, but I'm doing this for an office project.

I've got a Sony Ericsson k610i and its got a 2 megapixel camera on it. It takes good quality photos when there is enough light but its really bad at night. So this means I'm mostly limited to taking pictures in the day time.

I know how to use Adobe Photoshop but I'm just a novice user. Aside from tinkering with the brightness and contrast, what else can I tweak so I can make my pictures good enough?

Thanks in advance!

http://www.garryblack.com/photoshoptips.htm
???? gives a good idea on how to tweak the clolours etc. ????

Enhance? I hope you aren't talking about creating pixels that were never there in the first place such as in some tv shows and movies.

Uhm no, what I mean was sort of cleaning them. Thanks for the tip TheEx.