I was asked about keeping on display little Buddha statues collected for fun/art by a family that has now become more traditional.
The only issue is chashad. Will someone suspect a person of worshipping them? If they are the type that in a frum Buddhist home, they might actually be worshipped, then it would be a concern. If they are cheap, etc., clearly something for fun, decoration, etc., then it would not be a problem at all. See Shulchan Arukh YD 141:1-3.