For great Christmas cake ideas, one should look on websites such as Hobby Craft. Some decorations one can find are Christmas tree cakes, cakes that look like wrapped gifts and the classic ginger bread house.
Look on Martha Stewart, Southern Living and HGTV websites for lots of ideas for Christmas decorations. You can also try the Amazing Christmas Ideas website. If you just want to purchase the decorations, try a Christmas shop, since they may carry unique decorations.
You can find unique Christmas decorations and ornaments at http://www.squidoo.com/christmas-tree-themes. There are also gothic Christmas trees and decorations. Try http://www.squidoo.com/GothicChristmas
There are many Christmas decorations that are child friendly. Children can create ornaments, popcorn strings, snowmen, etc. There are many decorations that children can do.
I'd highly recommend checking Youtube on how to reuse some of your Halloween decorations for Christmas. They usually have some great ideas and would also be able to help you learn how to make your own to add your own personal touch.
Some sites to find Christmas ideas for decorating are allthingschristmas.com and diynetwork.com. They give decor ideas and tell you where you can purchase them.
I like shopping at Kmart, Target, and Walmart for outdoor Christmas decorations. However, their stock may not be out yet. Check their online counterparts or Amazon for some ideas.
There are many ways to decorate Christmas lanterns. They can be coloured, wrapped in garland, and hung up around other decorations to accentuate the decorations.
You can find unique ideas for Christmas window decorations at http://www.bhg.com/christmas/decorating/christmas-window-decorating-ideas. You can also find windows displays at http://shop.christmascentral.com/Xmas%20Lawn%20n%20Window%20Decor/Window_Decorations/ and http://www.christmascentral.com/content/pages/christmas-window-displays
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Browsing images of Christmas decorations is a great way to come up with ideas for your own designs. Some great places to look are http://www.fotosearch.com/photos-images/christmas-decorations.html and http://www.bhg.com/christmas/indoor-decorating/your-best-photos-christmas-decorations--2010/.
Some of the most fun Christmas decorations for kids are the ones they craft themselves. Sites such as familyfungo.com offer many different craft ideas to make beautiful decorations for Christmastime.