I've got a new entry template for Bookcase 0.9, which I hope to release in a couple of weeks. For lack of a better title, I borrowed a phrase from KMail and call it the Fancy template. It's got a lot of conditional XSLT stuff and I believe it looks pretty good, no matter what data is in the entry. For entries with images, those go down the right column, and all the rest of the data are in tables on the left side like so:
For entries with no images, the data is split into two equal column, grouped by the field categories, like so:
The colors follow the KDE system colors, so for different color schemes, the Entry View will look different. I'm pretty happy with how it turned out.