I saw this necklace on the Greater Good online shop a few days ago, and thought it was a great greenYgrey design.
There are many others on there, such as this Sweet Yellow Ivy necklace.
Guide Dogs Shop
In Blighty, how about this solar window thermometer, available at the Guide Dogs dogalogue shop, so you can see the temperature, while at the same time seeing how greenYgrey it is.
This has been a non-profit, non-charity charity-promotion blog post.