Companies from BMW to Kraft have invested a good deal in soliciting “open innovation” ideas from consumers, but the results have been underwhelming: Of the more than 23,000 ideas gathered by Dell’s Idea Storm site, only 2% have been put to use, and Starbucks has implemented an even smaller fraction of the 200,000 suggestions submitted to My Starbucks Idea (including 6,000 for new varieties of Frappuccino).