Just thinking along the lines of environmentally friendly, if that is a passion maybe you can theme the party like animals or plants, or flowers (for a girl) and have them dress up as their favorite flower? Then you can decorate with flowers, have a flower cake, make food with edible flowers in it? That could be different! and it's be bright and colorful... Then you could make up some games, not sure what but make them kinda educational. What ever the theme I was just thinking about sustainability... hey maybe a recycled theme LOL you can wrap the pressies in newspaper and use old containers to paint or decorate as an activity and then they can take them home and use them as their special box to write down all the things they are manifesting... Gosh I don't know really, just throwing some ideas out there