One suggestion would be to not have the toolbox user-resizeable via the window manager at all, but to have in the Preferences a setting where you use a spinbutton to set the number of columns. If you start from, say, three columns, and keep increasing the number, at the point where the number of rows is less than the number of columns, the colour, brush, pattern and gradient selectors could automagically jump to be at the right side instead of the bottom. --tml
