I want to do something that looks like the old painting an film, where you painted on the film stock. here is an example
. I would like to get the lines running throught the frames like the example at 38 seconds. i'm thinking i could use the paint brushes in after effects for this. I also want to use some custom brushes in photoshop for shapes and splothes and such. I've done a few test and doing layers in photoshop with brushes for the shapes, then converting the layers to frames this works great for some things. But not the continuous lines like at the 38 sec point of video example.
Create a tall photoshop document, use brushes to paint line(s) trying to keep the top and the bottom of the image as symmetric as possible the usen the offset plugin in AE to simulate a long continuous movement. You can also create different photoshop documents to keep it visually different.
Another approach can be doing the same thing in illustrator (because of its vectorial nature) then find a combination of plugins (roughen edges, some kind of distortion etc) in AE to make the lines more realistic...