Hi SignWriting list,
Recently, I had the chance to talk with Jonathan Duncan (SignWriter
Studio) about several issues. One issue he mentioned was size and
color within a sign. It started me thinking, and I made a few
improvements to SignMaker and the SignWriting 2010 Javascript
library.
I added padding, background color, and the colorize option. Here is
the sign for SignWriting with a padding of 10, a background of
"lightblue", and the colorized option selected. These options are
now available in SignMaker on both the PNG and SVG tabs.

For programmers and power-users, I have created a new type of
string, called the styling string. The styling string succinctly
describes styling for the entire sign and for individual symbols.
The styling string for the above is: -CP10G(lightblue)
* C for colorize
* P10 for a padding of 10
* G(lightblue) for a background color of lightblue
You can use the styling string in SignMaker on the PNG or SVG tabs.
You can also use the styling string on the SignWriting 2010
Javascript library API page.
http://slevinski.github.io/sw10js/api.html#sign
For the FSW, enter the sign string with the styling string at the
end. For example:
M523x535S10019478x475S10011502x466S2ea04507x502S2ea48485x510-CP10G(lightblue)
For the individual symbols within a sign, you can set the color and
size using a styling string. This is not yet supported through the
user interface of SignMaker, except through the styling string.
Here are 3 examples were individual symbols have been doubled in
size.

The styling string is definitely not a plain text concept, but it is
useful. I've put a presentation together about the concepts with
some examples.
http://www.slideshare.net/StephenSlevinski/beyond-signwriting-plain-text
Regards,
~Steve