I like layering necklaces and always combine some vintage ones I own with some new that I designed and made. The possible combinations are endless and include necklaces of various lengths, or all same length, but different textures/ beads... Yuo get the idea. It's the best thing you can do, if you have simply one too many necklaces:)
Here is just an example of 2 necklaces of same lengths that go well together.
Both necklaces are desinged and made by me.