Aha, I thought it was the letter V so I had been trying other letters to no avail, but using \ and / I have been 'playing' for best part of an hour now. I can see this thread blooming into a 'recipe' collection of "try 11 7 /\,\/" (the ',' is there to denot a space between the two \ \ characters).
You have probably created the definitive TH designer tool. With ready access to such an easy to use tool, I am sure the glory (or maybe gory) of THs will blossom and many, many folks will be encouraged to make some of these lovely finishes.
A little Googling for 'Tim Allwine' has listed a certain Senior Software Engineer with a Nautical and Knottical background, would this be your good self by any chance? I noticed the impressive table of decorative knots at the Maker Faire 2006, and I guess that if this is you, then the knotting world is lucky to have a Software Engineer who has a knotting fettish and can turn his hand to create such a landmark utility.
As a software engineer, you will be well aware of the situation, that once you start to give tools to folks that they find useful, it is not long before they start to inundate you with requests for embellishments.
Well, in case you have not already thought of them, here are three for you to consider.
First, the facility to 'fix' a chosen number of edge crossings into a single over/under configuration in order to ensure a stable final knot.
Second, the facility to create a library of settings, so if I discover a particularly attractive setting, then I can save it to my library and then share my library with others (probably on this thread).
NB I have noticed that if I create a TH and then put the page into my bookmarks then the details go with it - nice touch as a means of sharing patterns i.e. http://data.oreilly.com/jallwine/knots/?show_colors=true&strand_width=20&over_color=red&coding=%2F\%20\%2F
Third ask and the biggest one - what are the chances of having the utility 'Stand Alone', so that it can be used even when the user does not have internet connection? I have noted that if I Scrapbook the page, then it no longer works so I cannot use it if I do not have a live internet connection.
Enough for now, thank you so much for this excellent creation, I am off for another 'play'.
PS. Mel, could we put a link to Tim's page onto the Guild website please?