For free this month !
Particulor is an attachment that can emit particles on a selected avatar
Just wear it and clic on it or type /11go in the Chat.
> Choose "Avatar" to select avatar, all avatars in a range of 20 meters are in a dialog.
> Choose "Texture" to select the particles texture, all textures in the Particulor inventory are in a dialog (i put some free textures inside)
> Choose "Go" to emit particles. When you call the dialog you have new buttons : "Stop" to stop the emission and "Options" to change particles parameters : age, speed, count, scale, bust radius and rate. You can always come back to initial values with button "Reset".
You can change the textures in the particulor and add yours. Just rez the particulor on the ground and edit its inventory.