Ramps are a little bit trickier using the same rendering method as the one used for this pack since the software I use is very specialized, so I cannot guarantee perfect angles, but here is the result of some experimenting using height mapping to make ramps/thick tiles as an example. At the very least, I should be able to put together some tiles like these, that would allow transitions between the flat and thick tiles that are currently included. Is this sort of what you are looking for?
Viewing post in Isometric Tiles - Overworld Pack comments
I can definitely do multiple heights like that! The tile you put together looks great by the way, that is actually one of the intended uses of my Isometric Wall and Floor Texture packs too! They can all be mixed and matched with any of the Isometric Tileset packs to make new tiles or add depth to existing ones! I do have plans to update this pack with more heights and new tile types as well.