Tulula
Skeletron
I do see what you are saying and by contrast you can tell the two sets from each other, I just felt that personally for me they are too similar in style and by extent the colour scheme used. The examples you have show are different but in terms of decoration the blue/golden scheme is reminiscent of sky furnature. This is also more so for the blocks than the furniture. I think you misunderstood me, I love your set but personally I see them as only an extension to the existing sky furniture.
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Sorry but I don't see how the sets look too similar. Skyware is rounder and uses mostly teal with small amounts of yellow accents whereas Starshine uses a deep purple to blue palette and gold more equally with a pointier design.
This is only my opinion but honestly it is only a trivial issue, I would not be upset to see this in-game :]