One of the wonderful things about buying used RPG stuff is finding artifacts left behind by other gamers.
This was inside the cover of the City State of the Invincible Overlord book. The blue is lighter in person, and almost appears to be pale blue “white out” in consistency. Definitely a paint of some kind, and hand-mixed (thus the different shades from section to section).
The Wilderlands Home Map
Dyson's Dodecahedron 
Indeed a lovely treasure!
Nice. I found this character inside an old copy of the 2e Monster Manual at the Powell’s Bookshop at Portland Airport: https://78.media.tumblr.com/095bea2388885abf21c50e1230a1cfae/tumblr_nwhhjyRNT11uh71sco1_1280.jpg
I didn’t write that, but I had to look twice!
I used to draw different areas of the Wilderlands in close-up, on tracing paper with colored inks. Let me know if you find any of those!
That’s pretty amazing.
Yes! It IS wonderful to find the remnants from past owners of second-hand game material! It’s like an echo across time, and as the new owner you are the inheritor of a wonderful artifact. Very cool!