I suppose in the spirit of the site we should DIY our own Instructables merch???
As long as you do not do it for profit (ie, you can only give it away, not sell it), you're fine.
You can get high-resolution images of Robot here:
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If you'd like a t-shirt, all yoou have to do is become a judge. After judging five contests you'll be sent an instructable sprize pack
Thanks for the link Kiteman. yes anything I create with an Instructable image, logo, etc would be for personal use or a gift to a fellow nerd or nerdette.
they do that its cool, if you win a prize you get some stuff