Double Mahjong Game Icons
According to this resource, the game picture shown uses various icons downloaded from http://xicons.macnn.com. However, this address does not exist anymore. The only reminder there about icons is on the forum and leads to an old http://www.xicons.com, which does not exist either and redirects to https://interfacelift.com now. However, there are no similarly looking icons there (amongst freely available), probably due to long time passed.