re: Post your latest Start Screen & Backgrounds!
While I love the idea of transparent tiles/backgrounds I've started to not like a bunch of tiles that all have white icons inside a square with the same background as the rest.
that's why I use the non transparent tile/ theme color whenever possible and spread out my native apps. I do like that I can use a solid color though as a background and get more colors that the standard steel, cobalt, crimson, etc... Even if it is just on the start screen.
Here's my start screen to show you what I mean.