the pebblers i have are from hidecrafters.. the "pro crafter" series.
from what i understadn, they were designed by robert beard. hope to be able to get a set from him some day.
i have the tandy tools also. the give a nice texture but, not a pebble effect.
if you look at the last seat i did i used both tools. the pebbler around everything and the tandy tools on the devil wing
here is a closeup of what the tandy background tools do. they give a nice texture but, don't give the pebble effect