PhotoBlock is a WordPress plugin to make what is usually called: grid gallery. What makes special this plugin from other galleries is the ability to create custom grids.
👉 What is a custom grid?
Many galleries can render your images only with predefined layouts: columns, rows or squares. PhotoBlocks can make any kind of layouts!
👉 How do I make a custom grid?
PhotoBlocks is great because it let you draw your grid just as you would do with a pencil, thanks to a handy drag and drop functionality.
Look at the following gallery, you can see how image sizes are mixed all together: landscape, portrait and square images: