I am trying to make a thickened heavy cream that would be the same texture as "Creme Fraiche", but have not yet come to a desirable solution. As you guys know Creme Fraiche has a tangy taste similar to Sour Cream which is not what I am looking for. Please advise how I can make thickened heavy cream (not whipped cream) either with any available cultures in the market or individual experiences. Thanks everyone. 
I was thinking about that yesterday.  You could mix the cream with a little bit of Mascarpone or any other "Fresh" cheese (like Faisselle) 