When looking for amazing and impressive Thanksgiving decorations try Kohls and Macy's. You can get some ideas at http://interiordec.about.com/od/thanksgivin1/a/hol_fallthanksg.htm
Looking for holiday decorations? Look no further than your local crafts store. They have hundreds of items to choose from; and a creative mind can create wonders from scratch with merchandise offered.
Thanksgiving and Halloween both fall within the season of Autumn. Seasonal decorations for Autumn include pumpkins, dried corn or other squash, golden leaves, scarecrows and other items in the colors of deep oranges, reds and golds.
You could do a 'Nightmare Before Christmas' theme, like the movie, and use all your scary Halloween decorations for that. Or, instead of buying orange colors, buy black and white Halloween decorations and use the white ones for Christmas.
Some people start decorating as soon as immediately after Thanksgiving. However, as a general rule of thumb, most start their decorating on or before Dec. 1st with larger items.
Decorations ,
Amazon carries Halloween decorations. Most of their items are reasonably-priced and there's a wide variety. There's also books on creating your own decorations and decorations for food as well.
Habitat is an excellent furniture retailer offering very reasonable prices on many furniture items, such as chairs, sofas, tables, desks, lighting and home decorations.
Lanterns and other decorative items!
decorations (Christmas)
chromosomes could be blueprints or decorations
Personally I have found that in the Halloween Holiday I use fake pumpkins to decorate the outside of my house. When this holiday is over I am able to recycle them and use them to decorate Halloween. All I do is add more to the pumpkin such as maybe glue some leaves and brown colored flowers to it to make a nice Thanksgiving themed arrangement.
You can get yard decorations from WalMart. WalMart is a store that sells many items online. You can purchase decorations from WalMart and they will have it delivered to the store for free or to your home for a nominal cost.