Back again for a new screenshot of my desktop!
PS. Please read the whole post before asking for the wallpaper or the application name. It's all down below.
Going for dark mode until DP5! I really love the dark translucency on Yosemite and I hope developers will take advantage of this and offer both a light & dark version for their applications!
Yosemite is becoming really stable and with the new recovery update for developers you can finally restore to a fresh install of the current DP of Yosemite. Can't wait to see what Apple will feature in DP5. All tho Apple still has much to do before Yosemite is finished. Just 20% of iTunes has been redesigned and all of the utilities apps needs new UI's and icons so hopefully Apple will push out more with the next update. Not to mention Dark Mode is still unfinished but I doubt dark mode is one of their biggest priorities right now.
The wallpaper can be downloaded from my DeviantArt right here:
http://atopsy.deviantart.com/art/OS-X-Yosemite-457695444
The keypad app is called Continuity Keypad (Free beta) and only works if you have an iOS 8 device. Unless you want it for how it looks and it co-works with FaceTime to make the call.