Fall In Love With A Temporary Brush, Or Not
You can create a temporary brush anytime in Photoshop by playing with the options in the Brushes palette (which is nested in the Palette Well by default). After you make your choices, start painting. When you switch to another brush, the temporary brush you just created is gone. If you fall in love with your temporary brush (which is considered illegal in 48 states) and want to save it, before you change brush sizes, click on the Brush thumbnail in the Options Bar, and when the Brush Picker appears, click on the New Preset Brush icon in the upper right-hand corner, you sick pup.