Birthday Parties for 7-10 year olds

My kids have reached the age where it becomes more difficult to plan birthday parites for them. They still have an interest in having a party with their friends, however, they are less interested in the theme parties or having a location specific parties. What is a mom to do? My two oldest 7 and 9 are both boys. The older had a birthday back in October. We had a Wii sleepover party. It was a huge success and all the boys enjoyed themselves. Some stayed the night - others had sports conflicts etc and left around 10pm. We provided popcorn, wii games, borrowed some wii remotes and had a great time. This is the inspiration for the party we are creating for our new website. We are hoping to provide a wii/sleepover type of party framework. We are planning to include paper goods, invites, all the basics. For the party favor we are going to supply monogrammed water bottles for each of the attendees. We feel this a nice reusable gift that will be appreciated for months to come. I still feel we need one other good idea to complete the party and will be thinking on this topic. If you are interested check out the party at www.polkadotzkidz.com or leave comments with some of your ideas. Any ideas are welcome and appreciated. Well off to do some work - starting a new business takes lots of effort. Have a good one.