Could be something you ate, along with the bile in your stomach. Mine is a pretty green/yellow color right now. I ignore color for the most part now, I've had some interesting ones over the years. The only ones I pay attention to really is if there is blood, and how much!
Diagnosed with mild Crohn's Disease 2/06 after sever GI bleed. Has been suffering since 1998. History of rectal fistula and gallbladder removal. Currently taking Asacol and Questran.