Can I just say (as the curator of Built With Bootstrap) that we're very much looking for sites with great flair and creativity. At the same time we believe everyone deserves a fair and equal chance at some free promotion (http://builtwithbootstrap.com/post/19008579170/love-it-or-ha...).
At the end of the day, use what's right for the job and if you want to let the world know about it, give us a submission and we'll get you on there for free.
What if it's not an actual app/site, but a tech demo using Bootstrap plus some other stuff?
The one I have in mind is a tech demo of a Bootstrap module for a web framework. It looks good and is clearly Bootstrap, but very far from the default Bootstrap theme, and really shows off how customizable Bootstrap is. It also uses the Zurb Foundation mobile layout instead of Bootstrap's.
At the end of the day, use what's right for the job and if you want to let the world know about it, give us a submission and we'll get you on there for free.