I collect these and stick them in my notebook--I look for ones that convey a relatively large amount of information in one picture--easy for a GM to take in mid-session and easy to imagine any group of PCs running into.
Like for example the first one gives you a wizard who is: evil, in the middle of an incantation, holding something important, possessed of an impressive collection of alchemical glassware (one piece of which is broken), surrounded by webs and accompanied by rats.
Half of these are from Mike Mignola & Howard Chaykin's Fafhrd & Mouser adaptations.
Roll D12
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