Ok, so maybe its not a life-saving feature, but I havent seen it in any of the painting software I have tried
In a references panel, there should be a 'net search' input field. After submitting the query, it uses any image searching engine (google? search.creativecommons.org?) to display available references with
an option to 'import selected as a reference images'.

I think its a simple enough to implement, and it would save us a lot of time