Had a little play with Photoshop recently and shall share my findings!
Please click on the images for a better view. I had to, of course, try making a brush with type as well as other shapes and it actually works really well. There’s not an enormous amount of control available with brushes but to play around with all the jitter settings in the dialog box is lots of fun. A good little trick is to increase the brush size and colour ‘purity’ together – it’ll make distant shapes less colourful and nearby shapes vivid…giving a better sense of depth. These were only quick tests and I think a lot more can be done – ‘dual brush’ seems to offer a big opportunity for experiment…an airbrush used in a duo with a hard-edged one will make a feathered-edge effect, for instance, as in the last image here.