Make the gui theme nicer
The current gui theme isn't that pleasant looking. The main reason for this is that I'm not good at design at all and just used the existing CEGUI WindowsLook theme with some red "amber" like colours in various gradients.
Someone who's more aesthetically gifted should take a closer look at the gui and make it just better looking.
The CEGUI system for defining widget looks is extremely advanced and lets you pretty much configure everything in xml files. This however means that it's also very hard to get into: a fact made worse by the lack of decent tools from the CEGUI community. There are however some tools that might help, such as the Imageset editor. More information about these can be found at the cegui forum over at www.cegui.org.uk.