Rez the multi color particle fountain star on the ground and type "/66change". A menu will drop down allowing you to choose 15 types, 119 colors 3 sizes or turn the particles on/off.
You can also use voice commands on channel 66, as follows:
/66 on_off /66 small /66 medium /66 large /66 huge /66 rand_star /66 star1 /66 star2 /66 star3 /66 star4 /66 star5 /66 star6 /66 star7 /66 star8 /66 star9 /66 star10 /66 star11 /66 star12 /66 star13 /66 star14 /66 star15 /66 rainbow /66 random