GTetrinet has a number of old-skool xpm icons that should be replaced with something more appropriate of today's standards, and most of them could be replaced by standard icon theme substitutes.

Of the current icons, the user, team and hi-score icons seem the most difficult to replace. Any ideas?

A SVG version (based on the original, or using new ideas) of the GTetrinet icon would be ideal, as the lack of multisized icons makes it look horrible in GNOME Shell.