We provide an online programmer's console for Python developers. It runs in a web page and the benefit is that people can log in from anywhere and see the same session, so they can start working on something from their desktop and then pick it up later on (say) an iPad from exactly where they left off.
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The website for the Python language is http://www.python.org/. We are not directly affiliated with them (so we can't use their logo) but need to appeal to the same people.
A screenshot of a Python console is attached -- note the ">>>", which appear where the programmer types commands. This is a very recognisable symbol for our target market.
Old-school consoles were often green on black (think of people using computers in 1970s/80s movies, eg. War Games). We don't necessarily want to be *too* retro, though...