I'm not into celebrities either. There are a few singers/rappers I like, other than that there isn't anyone whose collaboration could get me excited. The only collabs that I love are the fashion designer ones. Not that I know anything about fashion, but I notice I keep liking the style of certain designers, such as Alexander Wang, Jil Sander, etc. So I'd love to see a collection like that.
Gareth Pugh was awesome. Although it was pricey and I couldn't afford much at that time. But I'd love for MAC to make a collection with high quality packaging like that again.