I'm trying out new icons for Edit, Preview, Output and Tidy tabs which are on the bottom of HTML-Kit Tools editor windows.
The new icons are much less colorful. They are grayscale, in fact. The goal is, though, to make tab icons less distracting while you're editing. Not that the current color icons (the top set of icons in the image) are all that distracting, but once you know the function of each tab the icon should blend into the background.
On a somewhat related note, Output and Tidy tabs may even disappear in upcoming updates when you open certain types of documents. For example, there's really no need for the Tidy tab when you're editing a *.txt file.