Some individulized chocolates or candies. Or make something on your own with available materials.
Some cheap and fun ideas for a housewarming gift would be something you make on your own. Maybe consider making a vase or a card.
You could take her to a strip club. Drink lots and then go home and nail her
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.
You can find cheap fun wedding decorations at walmart. Silver bells and hearts make good decorations. Also champagne glasses center piece can give off a very elegant look.
Christmas decoration ideas are sometimes difficult but once you get going, they're a lot of fun. This about.com article on Christmas decorating ideas covers a lot of areas: http://interiordec.about.com/od/christmasdecor/a/cmasindex.htm
Some good and fun picnic ideas can be found at the Funthingstodo.com and the Funideas.com. Both website contain a lot of fun ideas for couple or family picnic.
Have you tried AllFreeChristmasCrafts? The site at the related link is filled with fun ideas for all kids of Christmas crafts! My favorite gift is the Cinnamon Candle Gift.
You can freshen up your paint, buy some new pillows, get used furniture and refinish it yourself. These are all cheap and easy. Have fun.
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Go to birthdaypartyideas .com for a huge directory of party ideas for every theme under the sun. Most people plan parties on a budget so I am sure you will get some cheap fun ideas. Good Luck and Have fun.
You can find unique Christmas gifts for your husband at guyworld dot com. That site has everything every man would want. You can check out their site for ideas and to buy.
Some fun Christmas cookbooks that you can use to teach kids are Christmas Cooks and Christmas Cooking for Dummies. Both are very helpful!