ah, ok.
paint shop pro uses the same plugin types as photoshop (for the most part). these are any plugin ending with the file extension, .8bf . you can do a google search on just that, .8bf and you shld be able to find hundreds of plugins if not thousands.
psp also uses textures, frames, and tubes. these all have their own extensions for use in
psp and are stored in their own folders within
psp. you can also do a search on those names and find lots of good items. download them to their respective folders within
psp and make sure they are not 'zipped up' or in an .exe format. if they are, then you'll need to unzip them or run the .exe which hopefully puts the included files in the right place. be careful there, for there are harmful .exe's out there which you shldnt run. they contain viruses. so, know who and what you are downloading and running.
'tubes' are somewhat similar to clip-art and i dont think photoshop uses them. you can check out the
psp manual for more about tubes, textures and so on. there are lots of sites with freebies of these.
you can also check out the retouchpro library for links to sites with plugins.