Here is my test: http://commons.wikimedia.org/wiki/File:Wikidata_logo_idea.svg .
I am not a graphical designer, but a hobbyist coder; I found that a feature in Inkscape could be useful and I came up with this.
I've used the colors in other Wikimedia-related logos, the font face is DejaVu Sans because I do not have Gill Sans (furthermore, it's not free).
Joan Creus.