Sort:  

Yes- so much creativity!
Choosing one is very hard, but I thought the idea in @blustery-bison's doodle was very clever - plus I liked all the details. Look at the window in the building at the back - it looks like the figure in Edvard Munch's painting The Scream.

Hehe, simple and complex at the same time! Really clever. I also like the one from @daring-celt with a circle (the Earth) - very ingenious.

Yes- they joined last month, great artwork.