There have been a good deal of posts like this in the past, most of which have been deleted as many people would like to be compensated for their work and hardly anyone offers anything.
My suggestion is to either offer something in return, such as monetary compensation, or try to do it yourself for the time being until you can offer something other than an admin/mod spot at your board.
Not trying to be rude, but an admin spot hardly covers any time spent doing graphics work that is worth anything, much less anything else.
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