Here you can personnalize one of theme illustrations by system. For example you can have Bulma for just Sega Master System
or Goku for Super Nintendo etc..

It's simple,

1 - Choose your illustrations in "_illustrations" folder.

2 - Copy the ".xml" file you want (example: bulma.xml), don't cut but copy OK?

3 - Paste your file here ( CUSTOMIZE/illustrations/ )

4 - Rename your file with theme name, for example rename "bulma.xml" to "mastersystem.xml".

Sega Master System now display Bulma.