Try both plugins here:
http://www.techkings.org/threads/dsayers-picon-updater-beta.124621/page-5#post-804524
I found that the snp picons worked best for me.
The is a plugin available on wooshbuild plugins>download>extensions called setpicons you can use that to assign any picons missed.
If using the snp picons sone hints:
Snp stands for service name picons.
Either edit the channel name in your bouquets to match the picon name (caps and spaces don't matter) or the picon name to match the channel (you can do this in FileZilla)