We recently upgraded from 7.1 all the way up to 8, and among the GUI changes I see that we've gone to a shaded look for calendar appointments, where each appointment rectangle is saturated with color at the bottom but fades to white at the top.
I hate it.
My complaints aren't just about the aesthetics, but about the usability - I have several different peoples' calendars on my screen at once, so they're in a wide range of colors. When the blocks were a uniform block of color it was much easier to tell appointments apart, especially when several overlapped each other. The skinny appointment status rectangle along the left also fades from bottom to top, further complicating the visual cues. Sure, it's shiny eye candy to make it fade, but the calendar is a utilitarian device, not a piece of artwork. How hard would it be to at least make it an option?