I participated in the 2014 Color Run and declined to do the 2015 run because the price was ridic. Even on Livingsocial and Groupon, the going rate was $45! The 2014 packet included a t-shirt, temporary tattoo, sweatband, bag, and a packet of color to use as you saw fit. BTW it was a lot cheaper last year ($25).
The course was held in Downtown Fremont and drew a huge amount of people. They had to release runners in waves every 5 minutes or so. Needless to day, I didn't start the race on time because I was stuck among the crowds for 20+ minutes.
There were points during the race where volunteers powdered you with color. The color is basically dyed cornstarch, so it's safe, although you're likely to have colorful boogers for the next few days!!
Color Runs have become massively popular in the 5k fun run arena. Yes, they're pretty fun but after doing 5+ different variations on Color Runs they start to get a little old.
PRO TIP: This a run for casual runners. Also, tutus are a hit here.
YELP 100 CHALLENGE 2015: #83