Upside Down Blocks

This mod adds different angle of grass that allow for almost any orientation of grass faces. I've posted about it on my reddit. [u/goldentreesyt]

the mod also adds an ore called an Invertium Cylinder that gives levitation for 2 seconds when right clicked, and an item called an Invertium Flight Cylinder that allows you to fly in survival, as the name suggests. It's a fairly expensive item though, requiring 40 iron, a diamond, a slimeball, and 8 invertium shards. 2 shards drop per ore, but you can get 3 per ore if you mine it with silk touch and smelt it.