Silver

All silver panels should be considered limited edition, meaning, we only make small print runs of each panel, and there is no guarantee that there will be a second manufacturing round of it. 
So if you want a specific silver panel - do not wait to long with getting it, because when the current stock for it runs out, it might be gone forever. 

Also. Make sure to vote for the unavailable panels that you want. The panels that receive enough votes (voting is done by signing up for a email notification on the individual product page), are the ones that will be manufactured.