Oh my gosh, those rooms are gorgeous! *swoon*
The branches with leaves in the first photo look like apple, which is a known safe wood. Pear is in the same family and is also safe. Willow is also safe!
Maple also seems to be on the safe lists from multiple sources.
I also believe that most woods can be made safe if they are kiln dried or dried for a month or more. You’re right though, that there is a lot of conflicting info out there about which woods are safe and which are not, but there are a few that are always said to be safe (apple, willow are two of them). I tend to trust medi-rabbit for things, they have a nice short list: http://www.medirabbit.com/EN/GI_diseases/Food/Branch/Branch_en.htm
You’ll just want to be sure that whatever branches you get are not sprayed with pesticides.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.