When using the HTML-like RGB hex values, you can represent a range of colors by using the range literal. This range of colors can be used as a gradient for the background of any container. The gradient will smoothly (and vertically) fade from one color to the next.
Shoes.app :width => 300, :height => 150 do
background '#ffa500'..'#aaa'
stack do
title "Colors!",
:stroke => darkred
title "More colors!",
:stroke => '#efb'
end
end
