continual flame on a rubber ball, bounce it down the hall for suprise 'see ya' effect.
floating disc with silent image - a sphere of darkness (sphere of a...), a floating creature (beholder), a moving wall, a wall of near opaque gelatin (gelatin cube - watch it wiggle) to cover your approach.
put caltrops on the disc, a lot of them. you can will the disc higher then 3' up, which effectively dismisses the disc, dropping caltrops as a free action.
cover disc with blanket or such, have your midget friend hide beneath it as it sweeps towards your foes. Put a maniqin on top, x legged, and use ventriloquism or magic mouth to be mr spooky. put 2 continual flame rubber balls in its eye sockets for extra scary.
unseen servant apply poison to caltrops, then put them on the disc, or sheeth the weapon (now only risk in poisoning self is while wielding).
mage hand a paper/balsa wood frame decorated to look spooky (floating head or hand) or carry a bag of marbles, caltrops, alchemist fire, thunder stones, etc. hand drops stuff behind/in the middle of foes. true chaos, magic mouth on marbles/caltrop/whatever - "surrender, your surrounded", in orcish "were giving up" or in goblin "spare our lives, we'll serve you". not good for morale of troops!