I just got Pravana color enhancing conditioner and it is amazing. I got it in radiant red and it turned my cherry cola brown color a beautiful red wine color. It comes in 5 different colors. It is only sold at beauty supply stores...had my stylist by it for me...or I found it on eBay.
Update: I tried this with Ion temporary color masque in red and purple mixed with conditioner. My first try I was too scared to leave it on very long so I got minimal color and just on the ends
The next day I left it on longer. I loved the color but it definitely picked up in inconsistent patches. One side of my head turned out fine and the other was patchy and bright. It was still fun and washed out with a normal shampoo.
I'd definitely do this again but not put any on my top layer of hair.