If you are on Windows 10 Mobile build 10512 and you read my initial thoughts on it, you may remember my mentioning of the new wallpapers. The images are themed after Windows 10 on the desktop, and they work quite nicely with the OS.
To access the pictures, you can just go to Settings > Personalization and either pick Start or Lock screen. From there you will want to browse your photos, which is done through the Photos app. Alternatively, you can just go directly to the images with the Photos app.
Interestingly, the new wallpaper is filed under 'April 1975'. One reason for this is there is no longer a dedicated wallpaper folder (boo), so Microsoft had to put them somewhere with a date.
However, this is not just an ordinary date, nor is it random. Instead, April 1975 is the birthdate of Microsoft. Precisely, it was April 4, 1975. Don't believe me? Just ask Cortana.
Anyway, in case you were wondering why those images are dated as such, you now know. Hopefully, it brought a small smile to your day as well.