I think your pictures should be your own, unIess you use those from public domains.
But definitely, the ones you took should be your to use where ever you see fit, (be it for background profile pics or not), without fear of someone "borrowing" it.
Especially if it is on Hubpages, it's like content stealing to use someone's pics without asking.
I know anyone can pin your pics and edit it on Pinterest, but you're told about it upfront. That way you can use the pics that you don't mind when you see the edited versions when they pop up.