Recently I've made googly eyes bookmark, and I've thought that yes would nicely fit in that mouse model, and looks more beautifully. So I've edited with Blender. Eyes is 12 mm in diameter, glued them. Hole diameter 12.5 mm for eyes for fitting nicely. If you have bigger or smaller decorative eyes, you cand edit in blender file circle diameter and make intersection(because I don't know why difference in boolean modifier didn't work).