Domtopia's idea is not bad at all, only I can see some dificulties with the wide nationality of folks here on forum. Different country different culture and pretty much different stuff for each of us, which would not be bad if it is recognized by the others which I doubt.

Some idea of mine:          - Hat hut. There is a tiny but mighty mini-witch living in an old hat adapted to her needs. Design the witch's hut with or without the witch.

Thanks Em... and Hendryx! I like that idea too, of creating a tiny home for someone. Lots of potential there.

I hadn't thought about other cultures and what they may have grown up watching, but I would love to find out. What an interesting way to see what is in the minds and hearts of folks from all over the world!

I had seen this and thought it would make a fun challenge.

http://www.chadfrye.com/blog/?p=509

Take a famous painting and change it into a sci-fi or monster themed image. 

we've just done a very similar challenge ER

 http://community.imaginefx.com/forums/3/367815/ShowThread.aspx

Bad Movie poster

Pick one of the most badly made movies of all time...and redesign the movie poster to make it look like a blockbuster must see film. 

evil robot2:

Bad Movie poster

Pick one of the most badly made movies of all time...and redesign the movie poster to make it look like a blockbuster must see film. 

love this, i'm sure we've all seen 'this' movie!

This is a shameful rip-off of a competition currently going on at DeviantArt, but I thought it was a fun idea so I grabbed it and ran before anybody noticed.

Title: Superheroes in the future

Brief: What would your favourite superhero look in the future? Take an existing superhero and depict what they would look like in the distant future. These must be your own, original ideas so drawing Spider-Man 2099 and claiming job done is a no-no.

Wish you were here - create a holiday postcard for a well known sci-fi, fantasy or horror locale.

em...:

Voted Most Likely To... - High School Yearbook pictures of fictional characters.

That would be awesome! Lots of options with this one.