First you should have adobe Photoshop. Then open that graphic in it, click on the magic wand tool and click anywhere on the color part of the image, this might take a bit but mess with the tolerence to get the selection just right, then right click on the selection you should see a menu with an option to cut it out,click on it.cut it to a new file.now you should just have that funky looking acordian thing with no wall background.There thats it if you need to know how to make a white background then it might be a good idea to check out some tutes on photoshop.
I hate to say it, but that picture is a bit beyond a newbie's capabilties, simply due to the fact that there are some elements there that match too closely in color to the background, and are too 'fine' to clearly cut out.
Korruptking's method won't work. You'll want to look into using the Extract method found in the Filter menu of later Photoshop versions. This feature is great and removing backgrounds from areas of fine detail, such as hair or grass.
Another less-commonly used tool that I often use to exactly specify my selection areas is the Quick Mask Mode found under the background/foreground palettes. I would suggest that since you're new, you should first read up on these tools in the Photoshop help files and then explore them more in depth in tutorials when you get the hang of it.
ok, I gave up on that one, it's driving me nuts.. I guess i need more practice on it...
here is what i've done for another pic.. as you can see the Edges are very UGLY,, anyone have a better way to change the background color? I used the basic Brush, and Paint bucket.. as you know, that's what a newbie first do.. thanks again for your advice