The Chromatic Scales consist of twelve notes that all are all one semi-step apart (it can be compared with the contrary diatonic scale). As you can see on the picture below all notes are included. The Chromatic Scale is, therefore, not very useful as groundwork for a composition; instead it can be integrated as figures in parts of songs. For example, when you play a sequence of notes like G - F# - F as a walk from the G to the Em chord this can be referred to as a chromatic movement.
If we take the Chromatic Scale in C you would play it like this:
Ascending: C, C#, D, D#, E, F, F#, G, G#, A, A#, B, C
Descending: C, B, Bb, A, Ab, G, Gb, F, E, Eb, D, Db, C
You will not find pictures of chromatic scales in all keys, it would be somewhat unnecessary due to the similarities. The formula is very simple: all notes are included. A Chromatic scale in G would, therefore, begin at G and consist of all notes to the next G including one octave.
Use the Chromatic Scale for exercise
This scale can be used for an exercise training the control over your fingers.
Notice the instructions for fingerings: you should mainly alternate the thumb and the middle finger. Begin slowly and play strictly according to the advised fingerings. As you get more secure, you can gradually increase the tempo. You can also bring in more octaves in the exercise.
Use the Chromatic Scale for a melody
Here is another, more melodic, example.
This short melody line shows how a bass walk made by adding a chromatic note can be constructed.