Ideas for a party theme would vary according to the age of the person having the party. For girls and boys, there are prince and princess themes. There are also themes for tweens and teens, like Twilight. For those that are older, some ideas could be car related, music or movie related.
There are a variety of options available for one to find great party theme ideas for a five year old girl. One can find these ideas on sites such as Parents and Circle of Moms
Birthday party themes can be found in books or magazines. One can also ask others who have experience. One can also look in forums online for ideas.
You can find a guide to Halloween party ideas on Oriental Trading, Halloween USA, amazing mom blog, Party Universe, and party ideas. Each one has unique ideas.
You can find ideas for games, food, favors, etc. on many websites, including this one- http://www.babyshower101.com/. If you have a theme in mind, you can look up specific ideas that would work for it.
One can find log cabin decor ideas when one asks for the service and advice of interior designers. They may suggest a color theme, animal theme, Hawaii theme, outdoor theme, etc.
One can find some Xmas party ideas from the Marie Claire website. The website has an article that has suggestions of 12 Xmas party ideas that you haven't thought of yet.
Many magazines feature many Christmas theme party ideas. Marie Claire suggested alternative party themes, such as the Ugly Christmas Sweater Party, otherwise there are many websites dedicated to party themes which may cover Christmas.
One can find innovative ideas for a bachelor party on the internet from such sites as, Cigar Pass, Slideshare, Eventeve, Thirtyfifty, all of the mentioned can provide bachelor party alternatives and ideas.
One can find 50th birthday party ideas by visiting party stores or perusing birthday planning books in bookstores. One can also ask friends and families for their experience and ideas.
One can find ideas on how to host a cookie exchange party by watching videos and tutorials on YouTube or by reading ideas on blogs such as Martha Stewart.
There are many places where someone can find ideas on wedding party gifts. One can find ideas on wedding party gifts at popular on the web sources such as Exclusively Weddings and Etsy.
The main decoration will be the karaoke machine, but if one wanted some additional decorating ideas or theme ideas, Pinterest is a wonderful resource for party planning and decorating or one could certainly ask around amongst friends for ideas and input for the party decorations.