If you're tired of seeing the same new tab in Chrome or Firefox, you can give Tabliss a try.
It can change the wallpapers of the new tab at set intervals. You can upload your own images, or use the other options like Unsplash, GIPHY, Solid Color and Color Gradients.
To customize according to your liking, go to the options by clicking on the Settings icon on the top left of the new tab page.
There you will find Background options. Selecting Unsplash will bring you a variety of very good looking wallpapers which will definitely make your mood better whenever you open the new tab page.
Select the time when you want a new photo to appear or change in your new tab page. You can select the option to show a new photo once every 5 minutes, 15 minutes, 1 hour or everyday. Or pause changing completely if you like a wallpaper too much and don't want to see it go.
You can even set to change the photo each time you open a new tab - which is great if you want a different feel and experience from your new tab.
If you want photos from a custom collection, you have to type the unique number associated with that particular collection. For example - 1227291 for the Pumpkin, Spice and Lattes collection.
You can find more such collections here. Just look for the unique number of any collection and type that in the "Custom collection" field of tabliss and you're set!
You can also add your own widgets like weather, personal messages, time, to-do lists, Search Box, NBA scores, Literature Clock, Greeting, Custom CSS and more.
To edit a particular widget click on the settings icon associated with the widget or click on the widget name, like "Message" or "Greeting" and then you can edit it and write your own greeting or message.