My best and most efficient networking tip is the following:
When I see a person that I am interested in talking to I approach, smile, look the person straight in the eyes, extend my right hand and say:
“Hello, my name is Anders. How are you?”
This technique has provided more solid contacts and friends than anything else. A short chat usually provides a lot of interesting information and I never need introductions, colour marks and name tags.
Very simple and very basic many people say but at least I still see many people just looking at others from a distance without initiating contact when initiating that contact would add so much value.
Just do it! Just say hello!