How do I edit a background of a photo without photoshop?

I'm trying to create new refrigerator looking for pictures ... I really want to change the background my photography is possible without Photoshop?

Paint.net - http://www.getpaint.net/ Gimp - http://www.gimp.org/

xara remove background & Transparent background photo

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Artists Photo Reference Reflections Textures and Backgrounds by Gary Greene    US $17.49

Artists Photo Reference Reflections Textures Backgrounds Gary Greene Good    US $17.70

JAPAN BACKGROUND STORIES Fegen W P TOKYO 1954 RARE BOOK ILLUSTRATED    US $9.99

RODEO action photographs history sport background Broncs Bulls Roping    US $7.50

Artists Photo Reference Reflections Textures and Backgrounds Gary Greene Book    US $14.99

PHOTOS BACKGROUNDS FOR ADVERTISING 1991 PB    US $2.95