Weaving actual letters is not the only way of incorporating messages in a woven cloth.
As you know, I weave shawls with double layers, making the messages in Morse code. (And, in case you thought Morse is "out" - read a blurb about Morse-It, a new iPhone App, here. And no - I don't even own an iPhone, but I found it funny!)
Another way is "name drafting" - nearly all weaving software has some version of turning letters into overshot patterns.
The idea can be used in many ways - use colours, as does Bonnie.
Leigh has used bar codes - read here.
.... .- ...- . ..-. ..- -. .-- . .- ...- .. -. --. -- . ... ... .- --. . ...
(Here is one place to de-code the above message)