The new celica already comes with the projector headlights with the halo effect. I think you should probably post pictures of your friends ride and what's he's done inside the headlamp cause I highly doubt anyone is brave enough to open their headlamps and go glue crazy. Not worth the possible permanent damages and possible rejection if it looks ghetto. Besides, if ya glue anything inside of the headlamp, it'll melt from bulb and engine heat.
Now that's creative.
I bet this would also work to create a lighting effect in your car like those Neon bars...
You would just need to connect a cigarate light adapter on the end to power it.