In recent times I've taken to playing most PC games with my lighter, wireless, more ergonomic DualShock 3 instead of my bulkier, wired Xbox 360 pad. Most PC games only officially support 360 pads, and thus only include 360 button icons. If XCOM graphics mods become possible I hope someone can add PS3 button icons to the PC version. (Ideally Firaxis would offer this option itself, as it already has the assets from the PS3 version...)