1. Download choco
2. Run setup.bat
3. Run tsgen.bat SIZE FILES MERGED_FILE

   [SIZE]        32x32  
                 128  
                 256x128  
   [FILES]       file1.png file2.png
   [MERGED_FILE] merged.png
   
   e.g. "./tsgen.bat 256x256 top.png bottom.png merged.png"