I personally am a fan of them somehow wielding weapons on their hooves, either just some how sticking or being grafted on somehow. I also recently imagined that someponies might of fashioned some sort of helm with a Unicorn-like sharpened horn which could be worn by any of the three species. It makes sense to me since not only would it not obscure their hooves or mouths but will also offer head protection while giving them a weapon.