Bookmark this section, I'm going to update it. Once IMVU have finalized how the new particles are going to work
Download some free particle texture Just some random samples at low rez of a particles download pack I'm in the process of making, these are for additive light and work in classic client or studio.
Derivable Particle Meshes with instructions and textures Links to meshes I have made that you can derive from, includes links to all textures used and deriving tips.