I beat the whole game, so I wanted to give you an idea that would be cool.
For two different non-purple boxes linking each-other, you could make the laser showing the link a combinaison of their regular ones.
Example : for the chain box with the bridge box, it makes a cyan chain, and for the tele box with the bridge box, it makes the shape of the tele laser more straight or something, with of course the cyan tint.