If any illustrator/person who can actually draw (unlike me) would be interested in doing so, I would love to see illustrations of Tamer Creed mind flayers. For those who don't have copies of the Illithiad, they tend to be the front-line defenders of illithid communities, and (unlike most other mind flayers) specialize in physical combat, the better to deal with githyanki/zerai incursions and enemies that are resistant to mind blasts or brain extraction (i.e., undead, oozes, the psionically aware, those of unusually strong will). However, I offer no compensation for such illustrations other than "Wow! That's neat!"
Any kind of armor would work for such an illustration, with the following guidelines: Illithid armor is usually weird, and illithid armor generally includes some protection for the tentacles along with the rest of the body (though such armor would never prevent the tentacles from being used in combat). Some examples of illithid armor from various sourcebooks include: unusually lightweight plate armor (due to a combination of their generally superior 'technology' and ability of some of their crafters to psionically imbue items), light armor that literally bonds physically to the wearer's flesh and muscle, or even full exoskeletons. (But you can decide to draw totally different armor, too.) Almost any weapon/s would work also.