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You didn't got me right, i gave an example... I meant to something like compatision, the best script will win.
The "mission" can be some class building or somethimg, but not just one, but a challenging one.
Challenges are a great way to improve your coding skills.. but posting them on a forum such as this is tricky. Everyone is at a different sort of level. Take your initial example .. changing the height/width of an image .. that's the sort of thing I can do in my sleep (I run http://www.phpgd.com ..) .. but other people here might find that a real struggle if they're just starting out.
If you want to post a challenge you need to specify what sort of level you're aiming it at.