As a whole most of the phones offer similar options as effects and settings to the pictures taken standard are both the color effects and the White-balance adjustment, so none of them offers anything extraordinary in that aspect. What matters when working with camera is its speed, and how comfortable the interface is: the N93 was the fastest of the five, with the N80 coming close to it (thanks to the fixed focus, it shoots fast).
The most comfortable interface, in our opinion, is the one of the N73/N93 phones, offering easy to understand icons (you don't have to read what they are for) organized as easy to be reached shortcuts. This is superb, compared to the menus of the D900 (which is also quite inconvenient because of the portrait interface of the camera) or the N80 that has only indicators. The K800 settings are well organized with nice shortcuts, but we don't like the design of the icons.