Want to change the imagery on your smartphone? You'll find plenty of help with the best wallpaper apps. We've rounded up the top apps for both iOS and Android.

Users need to watch at least two ads to download any wallpaper in standard quality or SD. To download the same in 4K, one needs to pay around $50 per year as a subscription fee.

Today I stumbled upon Microsoft’s 4K rendering of the Windows XP wallpaper Microsoft Design site has a ton of attractive wallpapers, retro and otherwise.