gmod walking animations

is there a way i can change the gmod walking animations to something more natural looking??
also where would i be able to get new animations??

One would need to have the animations use the Move_X and Move_Y blend sequences (normally used by TF2, DOD, CS and L4D)

EDIT: I personally think the movement animations for the playermodels should be edited to be use the Move_X and Move_Y Blend sequences because they look strange when you transition from the running to idle pose, first it looks like someone is running and then they quickly transit to stop