There are websites that offer Christmas and Halloween decorations on sale. The website is www.allholidaytreasures.com/. This website has decorations for many holidays.
You could use white lights for both, though better choices would be orange and black for Halloween - white would be okay. You could create a Scarecrow for Halloween, then dress him as Santa for Christmas. That would be creative.
Halloween and Christmas are both popular holidays celebrated in western cultures. They both involve traditions, decorations, and special foods. However, Halloween is focused on dressing up in costumes and celebrating the supernatural, while Christmas is typically associated with gift-giving and celebrating the birth of Jesus Christ.
For the best tips and ideas on decorative balls that can be used for both Christmas and Halloween, please visit http://familyfun.go.com/christmas/christmas-decorations/christmas-ornaments/ for wonderful seasonal projects and ideas.
I have done a bit of research on the subject but I'm afraid I was unable to find many origami shapes that can be used for both Christmas and Halloween. Perhaps You could use a 3D star for both holidays and maybe a dove for Christmas could be colored black and turned into a bat for Halloween.
There are many places a person could find vintage Christmas decorations online. For instance, eBay and Amazon both have vintage Christmas decorations online. Other websites which have these types of decorations include Southern Living and Vermont Country Store.
Oxford Street and Regent Street are both famous for their Christmas decorations.
There are many places where someone can find information about Christmas light decorations. Websites such as, Christmas Central, and Home Depot both have information about Christmas light decorations.
Both Christmas and Halloween decorations can be costly, especially if you are trying to be the neighborhood show. It would also really help to know your location (general) to search by area. Some stores that sell party supplies include, your local craft store, Target, Walmart and Kmart and surprisingly your local grocery store. You can also check out Oriental Trading.
Yes you can make enough handmade Halloween decorations for two homes. Martha Stewart and allcrafts.net, both have ideas that would work. You could even get your children involved to help out.
Visit Martha Stewart's website which is MarthaStewart.com. You should also go to hgtv.com as well. Both site will give you great ideas for Halloween decorations.
Many decorations such as pumpkins can be used for both holidays. I would speak with someone at the retail location you are interested in purchasing from.