Tommy Khajiit expanding the MYO painting kit

Step 0: Make your painting

Make a new painting like the other ones and save it as Painting10.bmp in the \Program Files\Bethesda Softworks\Morrowind\Data Files\Textures\Myo folder. Making paintings is beyond the scope of this howto ;)

Step 1: Get NifTexture

This excellent tool made by David Humphrey allows you to easily change textures names used by meshes. Get it at TheLys

Step 2: Create a new mesh

Your new painting Painting10.bmp requires a new mesh. We will use an existing mesh, alter it, and save it as a the new mesh. Start NifTexture, navigate to your \Program Files\Bethesda Softworks\Morrowind\Data Files\Meshes\Myo folder and open painting9.nif:
MYOExpanding1.jpg
Highlight the texturename of the painting.
In the filename box, alter the name of the texture from Textures\Myo\painting9.bmp to Textures\Myo\painting10.bmp MYOExpanding2.jpg
Save the file as painting10.nif.
MYOExpanding3.jpg
MYOExpanding4.jpg
MYOExpanding5.jpg

Step 3: Using the new mesh in your plugin

Start TESCS, open MYOPainting.esp, set it as active plugin, press OK.
MYOExpanding6.jpg
Wait until the plugin is loaded.
Click on tab Misc Item. The MYOPaintings are located at the bottom of the list. Double-click MYOPainting9
MYOExpanding7.gif
Change ID to MYOPainting10, the Name to Painting 10 (or whatever you prefer ;)). Click the Add Art File button, the one that reads MYO\painting9.nif. The Select Netimmerse Model window opens. Navigate to the MYO folder and select painting10.nif.
MYOExpanding8.jpg
MYOExpanding9.jpg
Finally press Save. Close TESCS, reply Yes when asked to save your plugin.

Done!