Excellent suggestion. Although I think design is a skill that has to be learned by practice (and there's of course natural talent involved), Non-Designer's Design Book gives you a few concepts that allow you to better understand why some designs just look better and some don't.

One of the biggest tool for me was that you shouldn't be wimpy, but make big contrasts: e.g. select large font & small font instead of two that are too close to each other.