I don't know if this is the case at other institutions but at my university dissertations are published as A5-size books/booklets. There are some regulations on how the formatting is supposed to be but it's pretty relaxed otherwise. Common practice is that the PhD candidate designs the cover themselves.
Typically these covers feature an image relating to the work the person has done in the lab; a molecule, a graph, a microscopy shot etc. Recently a colleague of mine put a painting of herself on the cover. Just for the sake of clarity, not a painting she's done, but rather a painting of her made by someone else. This has raised some discussion among the younger students, such as myself. Thus I wonder, how much of a personal touch is OK really? Would something like I described above be seen as an ego-thing by a potential employer? I am of the opinion that it might be seen as a lack of modesty or "self-distance" (quotes are there as I am not sure if this expression exists in english).
Am I being too critical? As it's a multi-cultural international group of academics here, I wonder if there is a consensus regarding such "customization" of the dissertation.