Try this website
http://www.afraidtoask.com/bowel/index.html
Green stools are absolutely normal, yellow stools may indicate a problem with your Pancreas, and i stress the word "may", yellow stools on occassion can be the result of many things, food, meds,nervous bowel.To put your mind at ease, consult you Dr.
what does it mean if your stool is bright yellow?
Stool color is usually not anything to get worked up about unless it does turn yellow, green, black, white, or has bright red blood in it and it occurs more than once.
Also you want to report to your physician if your stool is clay colored as that can also indicate a problem.
No--you are absolutely fine. Stool color can vary everyday according to diet. Don't worry your fine.