What were Jason and his multicolour dream-coats dreams about?

You are likely referring to Joseph and his multicolour dreamcoat, not Jason. Joseph was a biblical figure, the son of Jacob, who had a series of dreams that foretold his future. The dreams were about:

1. Sheaves of wheat: Joseph and his brothers were binding sheaves in the field when his sheaf stood upright while theirs bowed down to it. This dream symbolized that he would have authority over them.

2. The Sun, the Moon, and Eleven Stars: In this dream, Joseph saw the sun, moon, and eleven stars bowing down to him. This represented that his parents and brothers would all pay him respect.

These dreams were interpreted as a sign that Joseph was destined for greatness, which eventually came true.