How about rings like these?
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Here's a way to do a tree and polka dots
This big tree could be done with vinyl. I like how colorufl it is too.
Another twig mobile, paper crane idea is kind of neat.
Interesting idea for a mobile, but also kinda creepy...
I like how the shelves are integrated into the tree. This would be good in the corner between crib and changing table
How about rings like these?
Q