photography~

How do you make it so your photos have light blobs? Such as: 1, 2, 3, 4. I understand you have to make your picture go out of focus, but do you need a professional/good camera to do so? I have a sony cybershot... and an old version of it .. :/ Any help??

Also, what do you use to write with light?? Do you need a good camera?? (examples: 1 - 2 . both from booooooom's facebook page).