If anyone is interested, I dyed my jeans last week. Oddly enough, the thread didn't dye. That was weird, but I was pleased to see that.
As for the color, I used Rit Dye (denim blue, I think). It came out okay. The color is a little weird for me; it has a lot of violet undertones to it so in bright sunlight you can really see it. The jeans were still semi-dark before I dyed them and I guess they are okay to wear, however, I threw in a pair of hubby's old, very faded jeans. Uhhhhh...the only way I can describe the color is old, man blue--those cheap jeans you buy at Wal-Mart--that color! LOL I guess he'll be wearing them in the garage! LOL
If I were to ever do it again, I would use the same color, just maybe add some black dye to the bath to take out that violet undertone (however, over a few washings it might wash out). Maybe a ratio of 3:1.
So that's my review. It only cost $2.50 so it was worth trying.