Recently on a project I rented and used the Profoto Spot Small, which allows you to use size m gobos and project patterns into your image. Spot Small
Although I like the tool and would like to buy one, I can't help but notice that Dedolight makes a much better version for a much cheaper price. Dedolight Projection
The dedolight adapter and the front of the Spot Small are essentially the same, but the dedolight will accept filters in front of the lens. Also, you can changed lenses for tighter or wider projections.
The interior of the Profoto Spot Small is black, so no light really gets reflected into the lens other then what directly hits it, which means the dedolight could just be placed in front of the strobe.
Any ideas on how to do this and attach the projector to a strobe reflector?