A particle brush of pony/seed beads. Make the particle sizes very small to make them considered seed beads instead of pony beads.
These are only the white rush tip images. This is so that you can make individual strokes and color/tone/patterns over them to make them look like they were organized by color.
To make the lineart stand out a little more, create a stroke of the beads on their own layer. Duplicate this layer and then go into edit and click “convert brightness to opacity”.
Adjust the settings as you need and enjoy using this freely.