Bubble letters are the most basic form of bubble graffiti, and all other styles of bubble graffiti are usually drawn from these basic letters. Bubble letters are achieved by writing the word or phrase in singular letters -- with spaces -- and then drawing an oval or sausage shape around each individual line of the letter. For example, the two lines of a letter "X" are outlined by two oval shapes. The graffiti artist then sprays around the edges of these ovals to make a larger balloon-like impression of the original letters. These letters can then be joined together, overlapped or left divided by spaces. They can also be outlined with a thick stroke by spraying over the edge of the bubble letters several times.
Some bubble graffiti styles are spray painted with angular and edgy extensions. Instead of turning the letters into curvy balloon-shapes, the letters keep their angular properties and take the form of a three-dimensional Times New Roman typeset. You can achieve this style by drawing rectangles around the letters of line instead of an oval. These rectangles create right angles at each corner and straight edges instead of rounded ones. Angular bubble styles also make it easier for graffiti artists to emboss their work and give it a three-dimensional effect.
Some graffiti artists draw larger oval outlines around certain parts of the letter -- this gives the graffiti a morphed and mutated effect. You can achieve the style by making larger oval outlines around some lines on the letter, but not other parts. For example, the tail flick on a letter "t" could have a very large oval drawn around it, while the vertical and horizontal lines might only have small ovals. When the graffiti artist paints over these oval outlines, the letter looks accentuated and bulging at the bottom but normal at the top. The problem with this particular style is that it can mutate the letters beyond recognition and viewers might not know what they are reading.