Hi,

Education.com's collection of science fair projects is here: http://www.education.com/science-fair/all-grades/

I did a quick search of the collection using the keyword, "plants," and here are a few to review:

Plants and Water
http://www.education.com/science-fair/article/plants-and-water/

The Best Choice for Growing Large, Flowering Plants
http://www.education.com/science-fair/article/best-choice-growing-large-plants/

I suggest searching the collection directly, though, to find those that most interest you (that will help provide the "fun" that you seek). As for "good," here are some tips for making quality science fair projects: http://www.education.com/topic/help-child-with-science-fair-projects/

Thanks for asking!

Material needed:
1.cardboard box(rectangular shape)
2.plastic cup
3.small bean
4.two-three tissupaper
5.strips of cardboard with one side square cut(same lenght of cardboard box width)

Method:
1.Take plastic cup,keep wet tissupaper inside it then keep the bean insde it.
2.Keep this cup inside the cardboard and whole the upper portion in square shape.
3.Keep the cardbord,place from were the sunlight comes only from the upper portion to the cup.

4.Fixed the strips to the cardbord one by one (another should be fixed when that bean grow into small plant and enter to the first strip whole) .Also see that whole of the strips shoud be always opposite.