We'd like something sophisticated and clean but also approachable - we don't want to scare people off.
Here's a bit more background on the organisation.
a) plain language to make communications from government, business, industry, the professions (including the medical, legal, information management, education, and communications professions) accessible internally and to a broad, public audience;
b) the use of plain language internationally;
c) research and development in plain language;
d) services for members, including marketing, networking, conferences, and communications.
The logo for PLAIN should reflect not only the organization’s goals and membership, it must also reflect its nature as an international organization whose members work in different languages.