This is what iOS7 UI should look like

C8ui_medium

Disclaimer:

Yes, I've created this and all donations goes directly to charity :)

Notes:

More matte than flat - I like that buttons look like buttons and not like any other text.

It's a theme and not just mockups. As such it's limited by what Winterboard, ColorKeyboard etc. can theme/change

More:

High res png image on droplr: d.pr/i/sawQ

Info, video and more on my website: andreaslarsen.dk/c8ui