1) Doesn't require that much math
2) Is interesting and somewhat unique
Every challenge I seem to find involves a lot of math and are very boring: for example doing the Fibonacci sequence. I would like a challenge that takes me to my limit and requires a creative solution. Math is allowed but not much please as it is hard for me as I have a hard time visualising it.
It can include graphics(I have graphics libraries downloaded and ready)
You can make it up on the spot if you want. I would think of something myself but I can never come up with ideas.