How to use ?
In the folder example_skin, there's already a working example.
Try first converting it.
On Windows: Run the Convert file
Other Os: Open a terminal and run the convimg from your platform.
There should now be a .8xv, .c and .h file created. 
We only need the 8xv. Transfer it to your calculator to see if it works.
You can view skins in the skin menu from TI-NYAN.

Now you probably want to make your own skin:
- You can have unlimited skins at the same time
- You have a certain amount of free colors.
All your skins (including frames) will use the same palette (set of colors, up to 254 colors),
you should move unused skins temporarily in another place so convimg
won't list colors from this skin.
- There's no semi-transparency. It's transparent or not.
- The transparent color is rgb(17, 0, 255). Use this color where you want transparent pixels.
- All frames must be 34x21. Although you can change this, be sure all the frames have the same dimensions !
- All frames will be resized by the game to 68x42 (regardless of the frame size)
- The only important thing you should name correctly are the frames.
They should end with numbers so convimg knows how to order them !
- You MUST have 12 frames. Not more, not less !

Now, here's what to do :
Copy the example_skin folder and rename it to whatever you want
In this folder, edit the frames as you want (it's not useful to rename the files)
When you're done with editing, we're going to edit convimg.yaml :
- Open convimg.yaml with any text editor.
- Do not touch the fixed entries from the palette. You can add some, but it's useless.
- In the images: section of the global palette, you should only specify the skin you're working on.
So you should change example_skin/*.png by replacing example_skin with the name you chose.
- In the convert section, change the name and the images. You can have multiple converts if you work on multiple skins.
- Each output section represents an appvar containing ONE skin (12 frames).
- Change the name of the appvar to whatever you want (Maximum 8 characters (inclusive), Letters (capitals or not) and numbers, do not start with a number)
This name will be seen as a file in the Calculator.
You should also change the include_file.
The last thing you need to change is the converts section of the appvar, just put the name of the convert of your skin !
Now you should try running convimg (with the Convert.bat on windows, or in a terminal)
You should see a newly created appvar containing your skin !
First check if it's showing correctly and publish it and share it to your friends !
If your skin shows incorrectly, make sure to check if there aren't any warnings in the convimg output.
PS: Thanks to you if you have all read :)