If you want to get into knitting displays for the large companies like Lion, Bernat or Red Heart, it might not be a bad idea to go to their web sites and click on the ‘contact us” link.  E-mail them about your skills, and send photos of your work, and say that you would like to knit display items. http://www.lionbrand.com/ has a great site and beautiful yarns.  Most of the major craft stores, like Michael’s Crafts and Joanne Crafts use their yarns.  It would be worth it, to send a quick e-mail and see if you get a response.  Here is the Bernat site link: http://www.bernat.com/.  You could also visit your local favorite yarn shop and ask the owner or manager how to get information about display knitting.  Often, they are very nice people, and they have the direct contacts to help you get some attention for your work.  Take some samples with you.  The large craft stores may want someone to knit for them, if their budgets allow it??