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I've made some decos with ultra-violet light reactive string. Here's all 4 of them.
The pictures aren't the best possible quality but will do for now :)

Star
Stars in the sky

Matrix
I had a black board where I nailed each side the same amount of nails and then played around with strings

Universe
Same here but this one is aboout 1.2m high and 2m wide and this has no board... only frames and more strings :)

Tree
I made this one into a dead tomato tree. Used some wire to make more branches and stuff

Mirror
Double 12cm x 12cm frames.