thanks for a great module.
BG doesnt add any classes etc to allow themeing, nor is there any theme function or anything that seems available for modifying the output. it would be nice if #370294: Add CSS Classes to allow styling was addressed at least (at last).
main issue for me was that the fixed width kills responsive design.
for those who may want this doable, i had to break the rules and hack, uncomment line 390 (and comment out 391) to get the .brilliant_gallery class on the BG <ul>, then add to my css ul.brilliant_gallery {max-width:100% !important;}. note this makes column count override work fine until the screen is less than the fixed width. tested with square images but should work otherwise.
would be great if this were an option; responsive is popular these days.