Hmm, I vaguely remember seeing little beanbag chairs for various electronics. Do you mean something like this
http://www.etsy.com/listing/52286284...rder=&includes[0]=tags&includes[1]=title&filter[0]=handmade ? I also just found this
http://cubiclebot.com/mobile-devices...for-your-ipad/ which would probably work for an ereader. Are you after something to set it on for charging or to have somewhere easy to put it, or something to prop it up while you read?