Style Not Substance

The results of Challenge #2x01, Selective Colouring are:
( results )
Thank you, everyone!

I've also revealed the entries in the challenge entry post.

Now, discuss! Talk about how you did it: techniques, tips, what you found hard, what you found easy; that sort of stuff.

Welcome to challenge #2x01, "Selective Colouring"; this is "season 2" of icon_style!
For this challenge, each icon you make must use selective colouring; that is, most of the image is changed to a "false" colouring (usually Black-and-White, but it can be colourized in some other way) and the original colouring is "restored" in selected areas.

My apologies for the lateness of this, but we can still finish this in this month, so I'm going ahead. Go us!
( more and rules and dates )
In short:
Due 29th of May 31st of May, post entries here, don't show them elsewhere.

If you know any good tutorials for this challenge, please post a link.

And please pimp this far and wide!

Also, if you have any ideas for challenges you would like to see, don't hesitate to suggest them. No, I'm not running out of ideas, but feedback is good.