Okay, this needs some work... If you were to imagine the picture in your head, you will alter your whole way of breathing and thinking, of course. This will be where you will manifest the illusion, as we have learned, subconsciously, and, then you will personify the illusion while it is being made.
If you were to then breathe out a lot, you should be able to project the illusion in front of you. This would be done by manifesting the illusion with a mental image, maybe of sound and scent too, and then affecting the gases around you. This would be where you need to think of colours to be seen, otherwise it will not work. Then, you would need to get these colours going by putting punctuation into your breaths coming out, of course, by altering your mental image.
Imagining colours and working with them will also be important. Imagining that the different atoms of hydrogen, helium, lithium, baryon, oxygen, carbon and nitrogen, and, mixing them up, merely thinking of numbers and matching them up, should do the trick.