Coin Smartphone Screensaver DIY

I thought this was pretty cool. Use the the app Photoshopmix to crop photos of your coins and make a collage of them. It only allows 5 pictures but you can save that project and reupload it as a single photo and layer new photos onto it.
I justed wanted to share this is all, I like seeing my favorite coins on my phone.

Well, I can write program like this myself :)

Nice for a background picture, if you want to commit 100% to your hobby.
But what use has a smartphone for a screensaver, it still wastes precious energy?