Everytime i need to fix a bainmarie when i am working i need to steal the ceramic lampholders from a 500w QI fitting, so i am always left with a brand new enclosure with no guts in it. I think i have about 5 of these saved up at the moment. I am thinking of building some high power ones with some 10mm leds of some description.
As for the rainbow floods, i have got alot of offcuts of clear acrylic 3mm sheet that i was thinking of cutting out and chemical welding the pieces into a box similar shape to the floodlight encolsures.