Lucky Blocks is super-fun to open up especially when there are ten types of them. These blocks are a good investment of your resources - it usually pays off generously. Each type of Lucky block drops a different set of items, but there is also a rare one that can drop everything. Some blocks will be spawning naturally underground, and most of them can be crafted.
How to install addons:
Download addon straight from your device
Find and open .mcpack or .mcworld files that you download earlier
Click it to import into Minecraft Pocket Edition
Open the game
Create a new world or edit an existing world
Scroll down to Add-ons section and select the ones you want to apply