Like many others, I felt like Nightmare Before Christmas was made just for me in that in combines two of my favorite holidays and gave me tons of decorating ideas that could reasonably be up for a few months. It's perfect for me since I'm lazy about putting up holiday themed decor.
Every time I've visited Holiday Haunted Mansion, I've admired the mix of ivy and berries and grapevine and fall colors that went into their decorations. Especially these wreaths:
Hot glue gun, glue sticks
Black acrylic paint
White acrylic paint (not necessary if you find the right ribbon)
Paintbrushes - I recommend a big foam one and then a smaller one for details
Scissors or wire cutters
2oz block white or cream/ivory polymer clay
1.5" wide or bigger wired ribbon - ideally black and white striped or just black
5 yds+ of black tinsel garland
Fall floral decorations such as leaves, pumpkins, berries, pears, etc
Ivy floral decorations with berries
*Instead of using a grapevine wreath as the base, you could start with a black tinsel wreath (those are available right now and you can probably find them on sale this close to Halloween) and add some grapevine.
Add the items to your wreath wherever you want them. If you're not comfortable attacking it randomly, sketch it out first. Don't be afraid to rip apart the decorations you bought. I attached some whole, but I also ripped out leaves and individual berry sprigs. Scissors and wire cutters come in handy here. Be sure to leave enough of the wire to wrap around the vines in the wreath. Keep going until it looks right to you and leave some blank space at the bottom for the skull head:
Pinterest is your friend.
Since I wasn't able to find black and white vertically striped ribbon, I painted on white stripes. I didn't draw guides before I started painting, but that probably wouldn't be the worst idea. I used the wrong end of the paintbrush to dip in the paint and "draw" the lines. I personally like the uneven and messy look for this project but if you don't, you can draw guides and use the right side of the paintbrush to make them prettier. Regardless of the method, set the ribbon aside to dry while you work on the skull.
Hot glue the ribbon to the back of the skull (in a few places) and let it dry. Once dry, hot glue the skull to the wreath. I let it dry and added another layer of hot glue for security. Let everything sit and dry overnight before you hang it on your front door.