You could also replace player model with a big spiky thing. The spikes would poke through walls. Or in team fortress, replace the sniper's red aimpoint dot wit

You could also replace player model with a big spiky thing. The spikes would poke through walls. Or in team fortress, replace the sniper's red aimpoint dot with a big model. They become easier to avoid. Of course not great from large distance / players behind multiple walls but I think the server wouldn't send you the info of those guys anyway.