Muzei is a wallpaper app I use on my Android phone. You can get it at the Google Play store here.

Muzei blurs your background image so your icons stand out more.

You can change the density of the blur, dim the image and turn it to a grey image [see image]

If you double tap the screen the original picture in all its colour appears for a few seconds and then blurs again.

You can add different add-ons from the Google Play Store which have different photos on or you can choose an individual photo/folder on your phone.

You can also change the frequency of how often the picture changes.