Here are a few likely spots for the extra small illustrations for The Omega
Zone:
http://www.projectaon.org/data/trunk/en/png/fw/03toz/ill/williams/small12.png
95 244 255
http://www.projectaon.org/data/trunk/en/png/fw/03toz/ill/williams/small13.png
33 (or 149)
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Jon