Intellij IDEA's default color scheme is ok, but I've never been a fan of white backgrounds for code editors. I find the glare to be too bright after a whole day cutting code. Instead, I prefer a deep blue background with light colors for text and keywords.
A friend from work came up with a scheme similar to the style I like (he has a black background though). Jon Eaves coined the term "Angry Fruit Salad" for its look. I like it so much I felt compelled to share it with you.
Java code looks a bit like this:
XML looks a bit like this:
Like it? If you want to use it, feel free to download Angry Fruit Salad. Just drop it into the "colors" directory under you IntelliJ IDEA installation and you're away...