NOTE: This post is out-dated. Please visit the newer post which features source for the new icon style.
Dear 3rd Party Component developers,
we at the Grasshopper® development team (hereafter GDT) are thrilled by your enthusiasm to develop custom components and widen the base of the Grasshopper platform. We feel it is important your products become an integral part of Grasshopper, and are therefore shocked... shocked and appalled at the quality of icons we've seen so far (yes, Jon, that means you).
In order to facilitate this process, the GDT (unanimously) agreed to make the source for all the original icon images available online. They have been attached to this post for the time being, but we hope to centralize all developer resources someday soon.
You are free to copy and modify these graphics in any way you see fit. They come free of copyright and copyleft restrictions.
You'll need
XaraX to open these files (a free 30-day evaluation is available, but it's cheap and really quite good, the GDT highly recommends it for any sort of vector-based computer graphics development).
Also note that almost all icons used in Grasshopper have a drop-shadow applied to them (2 pixel blur, 1 pixel offset towards the right and bottom, 50% opacity). This typically means you should refrain from drawing anything in the 2 outermost pixel columns/rows, otherwise the shadow will visually intersect with the icon edge.
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GDT