As far as I know, your Arabian coffee
plant should be just fine -- a friend of mine, originally from India, tells me that the coffee leaves themselves can be dried and roasted, then ground and used as a coffee substitute.
I don't know if it's the same
plant, but I think the botanical
plant name of China doll is 'Radermachera' .. if so, it's generally safe to ingest, tho not recommended.
Here's also a site that lists
plants that are non-toxic to pets ... if they're safe for our furry & feathered companions, they should be alright for us too ..
Plants & Pets - Non-Toxic Listing Frann