Guys Help Me Choose the Theme for my Training =D

To all my friend would u help me choose the theme for my draw? like what theme i must to draw, like 1. Penguin, 2. Ghost In The Barrel, 3.etc. This is for my training , write your crazy theme in comments , Thank you so much!

This is list crazy theme from my friend:

1. Hitler in ultraman costume.
2. Pig in the bubble.
3. My Box Head With character coming out from there.
4. Jurasic Park Theme.
5. Lux Dude Lightsaber Duel Wit Teresha.
6. Octopus Band.
7. Singing cactus.
8. A horse riding a kid.