Right okay i followed the tutorial below to create a projection for the stained glass window. What it does is make a light project a texture onto the floor and assets and so this should make it look amazing. I oversaturated things to make it show more but you get the point.
The thing to remember is don't add a spotlight, it doesnt work, you have to add a SpotLightMoveable, this is very important if you are following this tutorial and the guy forgot to meantion it doesnt work with a normal spotlight. Thank you Heather for helping me fix it :D
Other things that will be need to suppot this are god rays of supporting colours and dust particle probs :) it should look amazing but it also might look too much but it's all trial and error