https://en.bitcoin.it/wiki/Colored_Coins
Colored Coins - Bitcoin Wiki
colored coinsbitcoinwiki
https://www.fleur-de-coin.com/eurocoins/estonia-color-euros
Estonian 2 euro coins - Artificially colored coins
A list of colorized 2 euro coins issued in Estonia with detailed specifications and hi-resolution images
euro coinsestoniancolored
https://www.numista.gr/en/monako-2/
Monaco - Colored 2 Euro Coins - Coins - Numista
euro coinsmonacocolorednumista