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There's a load of different stances you could take on this picture. A few I think might be good are:

A leaf falling off of a tree.

A motorcycle blurring past with a crowd of cars waiting in traffic.

A student taking a leisurely walk with everyone else rushing past.

Hope that helps :)

Capture an image of you and your mother or better yet grand mother.

I captured an image once of an old gothic style church reflected on the side of a glass facade building.

If there is a construction site anywhere near you, try to capture an image of the construction site and the surrounding older structures.

How about a picture of many people walking accross a crossing in the city? And make it kind of blurry to get that effect of the speed and time thing.

....

How about a timer or an hour glass? Or maybe you can composite a before and after picture, or use a slow shutterspeed to blur movement.

a sun dial put a stick in the ground and draw a circile around it take a pic get an a

a progression of flowers. they could be in a vases, with the water slowly getting lower and lower as the flowers begin to wilt.

an hour glass?

umm like that one picture of evolution u kno the monkey one? :D

day light throughout different times of the day, then put in a sequence :)