First of all to make your workbench look better you can also use MUI,reqattack (for very nice requsters),visual prefs,caboom.
This combination works well on my system but it does not work on every amiga!
for birdie my startup sequence line looks like this:
Run >NIL: C:birdie C:001.jpg C:002.jpg activepattern
read the docs for more info about the options active pattern is just 1 the options