For the operators of the tumblr: Here's the SVG version of that playground pony. Everyone on the tumblr is welcome to edit it and use it in answers
The avatar/icon thing could probably be given a better crop. [The easiest way to do that in Inkscape is to add a square, make it invisible (opacity to zero) and export 'selection'.]
There's BUCK up in Manchester. I'm not sure yet what will happen there, but hopefully the programme will be released soon. Are any Playgrounders thinking of going?