If you don't want to bother with being creative, you could always do the three kinds of plants experiment.
All plants start out identical.
If you really want to, and you have more than one plant of each kind, you could so a statistical analysis on it, as well, so see if the differences are statistically relevant. You could do a project on bioluminescent animals, or animals of the hydrothermal vents. Both very interesting. That's all I can think off the top of my head. Current Events Chatboard Politics Chatboard Gatherings Chatboard Teacher Social Chatboard Golden Apples Chatboard Inspirations Chatboard Teachers.