Sure, having a studio is helpful, but you can create your own with a white sheet and some lights. Then it's just a matter of picking your background and photographing it without people around. If you want to add a new dimension to your photography, give composite photography a shot.
Tom Di Maggio writes:
My use of composite pictures has been drastically increasing in the last few months. It started with locations that got cancelled due to unavailability, then bad weather made it impossible to shoot at certain location and as of lately people came to me asking specifically for composite photographs. And to be honest I really enjoy doing them, it gives my imagination a lot more freedom, and there is certain flexibility that I really enjoy.
Read more at Digital Photography School