This userstyle is for the new version of Google Calendar (which has a muted design).

+ Removes the header menu items (that link to other Google services)
+ Removes the search bar
+ Converts text of individual calendar items to white, adds grey hover
+ Converts current day background to pale yellow, and the hours sidebar to grey/blue

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I put this userstyle together for my own convenience (my friends and I wanted to change a few aspects of it). It uses aspects of styles created by other users. If you're interested in the original versions of the styles, see:

Slim Header: Google Calendar (New Version) - Slim Header More
Better Style: Google Calendar - Better 2011 style