Question??
The dots on the image that you supplied looks more like a tube that comes with PSP. It is called the Glitter tube. If you are wanting the color to be different then make a new raster layer over image and apply glitter tube. Select all and float and colorize to your own liking. Now if you are looking to use a uniform application, in other words rows upon rows of dots, etc. then Cybia, www.cybia.co.uk , makes a plugin/filter that is called screenworks. It is freeware and has some interesting settings! Hope this has helped and not hindered! Good Luck and Happy PSPing! *smiling*
~Mischa