I was actually thinking more about this kind of particle:
sync on
sync rate 90
create bitmap 1,32,32
for i=0 to 360
for j=0 to 14
ink rgb(255-int(j*15.9),255-int(j*5),255-int(j*15.9)),0
dot 16+(cos(i)*j),16+(sin(i)*j)
next j
next i
get image 1,0,0,31,31
set current bitmap 0
delete bitmap 1
make matrix 1,1000,1000,5,5
make particles 1,1,1,100
set particle velocity 1,6
set particle emissions 1,1
set particle gravity 1,3
position particles 1,500,0,500
position camera 500,100,0
do
sync
loop
I've changed the j loop limit value to 14, because after viewing Quoth the Raven's program the image looked a bit square, so I've made the circle smaller so it looks more circular.