The new Modern and Russian sets will remind to most users the mobile version of Richard Lang's ChessGenius. It's not a coincidence because they are designed by Bryan Whitby, the same artist.
A notice from Bryan explains: "I initially designed both sets for Richard Lang's ChessGenius handheld computers. Richard still uses my original Modern set whilst Aart will use a slightly updated version. The Russian pieces were designed as an additional set for a recent ChessGenius update only Richard's are silver & black and Aart's are Brown & Silver."
Chess for Android is indeed more attractive with these new goodies.
Download latest version of Chess for Android from GOOGLE PLAY.