Anyone might use these ornament for FOWLR tank?

[oyf709]

I came across one of my friend's back yard and saw him got quite a large amount of these "Tank Ornament". I found out my friends family used to own a factory in HK before they immagrate over to Canada that makes these ornaments and are fish safe. I offered him to help him see if anyone in the community might actually use these in their FOwLR tank( i don't think any one would use it in their reef tank but who knows). I would also like to see if anyone can give me some price check also since most of the ornaments are a lot smaller than these one my friend has. Most of them being sold are around 4-8inches and largest I came across was about 12inches.

Here are some picture. This is the largest piece I currently have and it is 19 inches tall, 14 inches wide and about 9 inches deapth.


some other pieces here






This is what it looks like inside


Thanks for your help ahead of the time =)