Just a quick one. Remember the colors we see when we view the requests we submitted as a concurrent request? Green when it is in pending or running status, Yellow for warning and Red for the errors? Do you know these colors are controlled by a profile called FND: Indicator Colors. If you se the value to Yes, you will these colors, if you say No, you will see no colors. Also I noticed, the prameters that are required while submiting the concurrent program usually show up in Yello color (standard for required fields). If you set this profile value to No, even they are becoming white.
Try it and feel the effect for yourself. I did not find any profile to set your own colors.