I have been doing a lot of doodling lately. These are some of my better ones, taking no longer than 15-20 minutes, not a whole lot of effort. My shading and dimensions are quite crap. Apologies for the "Le" but... no.
Le Predator
Spoiler
Le Cooler
Spoiler
Le Meta Cooler
Spoiler
Le Janemba
Spoiler
Le Daleks
Spoiler
Le Mecha Frieza
Spoiler
Le Dinosaur Fight
Spoiler
Le Tyrannosaurus
Spoiler
Le Cyberman #1
Spoiler
Le Cybermen #2
Spoiler
Le Sideshow Bob
Spoiler
Le Lord Vader
Spoiler
Le Perfect Cell
Spoiler