Challenges?

I just bought the 159.99 version of Maya for my soon to be repaired laptop. So! I should be on it very very often and want to improve my 3D work, so the "Challenge 1" thing is for me to start work on my imagination and how well I can get at 3D without looking like a "noob". I'm going to finish one challenge then ask if anyone has any ideas or work on a personal idea. I don't know at the moment.