As for ideas...zombies are fairly easy to do, dead bride, dead anything really. For a zombie just shred the bottoms of top and pants or a dress, add some dirt and blood stains/wounds and paint your face.
Cut off legs, open one side seam on each leg and also cut off the double seam, sew the 2 legs together together. The widest end is the bottom of the apron. Add neck ties and waist ties. I didn't hem the outside edges of mine so it has the frayed look. I used back pockets from an old pair of jeans and added pockets to the apron. And I used the cut off double seams to make my neck and waist ties.