craftgrrl | caution tape guitar strap..

I'm thinking about making my friend a guitar strap made out of caution tape for his birthday, because his boring black guitar strap is too boring. His birthday is in one week.

The thing is that the caution tape has to be really durable, and I'm not sure how to make the caution tape thicker. I'm thinking about having 2 layers of the caution tape and then in between the layers I'll have ductape. Then, I'll cover the caution tape with clear packaging tape. I don't know if that will be durable enough though..

And also, I don't where to get the little triangular shaped thing that allows the strap to be connected to the guitar. Like the sort-of-triangular-shaped thing on this guitar strap:

Do any of you know where I could get one of those, or do any of you have any ideas on how to improvise and use something else instead of the triangular thing?

Thanks for any ideas!