This app was mentioned in 15 comments, with an average of 1.13 upvotes
Or use this app (for android)
Create two profiles, one for lockscreen and one for homescreen. Put one normal picture and one weeb picture in each sequence. Then you can cycle both lock and home wallpapers from normal --> weeb in one click, with the 'change wallpaper' quick setting you can add to your pulldown menu.
Check out 'Changer - Wallpaper Manager' in the Play Store. I've been using it for a bit now and it works quite well. You can set different profiles\settings for the Home and Lock screens.
https://play.google.com/store/apps/details?id=it.simonesessa.changer
Right now I have to use Changer from Play Store, which allow me to set the folder and add or remove image to that folder. And I can change just the lock screen without changing home screen too.
Would love to have FOSS though.
Tried many, here's two that I like:
Changer is the best one I found. It has no intrusive ads and no limits to how many pictures you can cycle through. You can import the pictures to the app or you can choose a folder (or cloud folder) for it to use pictures from. Alternatively you can also add conditions based on weather, time of the day, location and connected wifi. It can also pull random images from unsplash and use them as wallpaper. It doesn't use much battery. It has a widget that you can use to manually change the wallpaper as well. The only negative is that it doesn't use pseudo random so you might see the same image back to back.
Smart Wallpaper is a close second. It's less powerful but easier to use. It has no ads and a 250 picture limit. It can't take photos from a folder automatically, so you need to import them. It also supports conditions like time of the day, weather or wifi. It also doesn't use much battery.
There is actually a bunch. Depends on how granular you want to set up everything. As already mentioned Muzei works. If you just want to select an image folder and select and amount of time which should pass (or unlocking your phone) the Changer - Wallpaper Manager would also be an option: https://play.google.com/store/apps/details?id=it.simonesessa.changer
Changer is a very flexible wallpaper changer , which has a lot more customisation than I've seen from other apps!
It lets you use folders (both local and google drive) and collections of pictures. These can be set to change at specific times of the day, days of the week, weather conditions or even wi-fi networks!
I haven't used the function myself, but if you don't want to download your own wallpapers it's got a few options for getting photos from the bay too, like Pixabay and Unsplash.
I have been using Changer (link) and it has been really good, can set up different sets for the home and lock screen, and it doesn't appear to impact battery life at all
Try the app called changer in the play store. I have been using it for along time now and has the ability to turn off wallpaper scrolling which centers the wallpaper
https://play.google.com/store/apps/details?id=it.simonesessa.changer
Not sure if it's open source, but I use Changer
I like Changer
I use Changer
I assume this one... https://play.google.com/store/apps/details?id=it.simonesessa.changer&hl=en_US
Been using this for awhile now