Some friends of mine have been working on a fantastic 2d terrain toolkit for Unity 5. Sam Sawyer and Michael Chugg as lead programmers, and myself as the artist.
In a nutshell, with a specialized 2d tileset, these tools allow you to make complex terrain very similar to Rayman Legends.
The toolkit gives you a lot of control over variables, including per-point thickness control
There's a lot more features to come, including an entire lighting system what uses this same shape system to allow you to light large sections of scenes, or entire scenes, very quickly. No more tedious per-object lighting only!
For the 2d artists here, making the tilesheet is a little tough at first, but once you have the system down you can start pumping these out like crazy. Start with a 'block,' as everything else on the sheet is derived from it.
This block is already one section of your sheet.
When the tool is released, I will have a video tutorial on how I paint these whole sheets
Expect more updates later! Sam may come in and answer questions, and post updates with new features the tool has. Thanks for looking!