Dzien dobre !
Thanks for the inputs which are unique and interesting
#24 is a little extreme . the 'i' looks like it is falling down (like a set of dominoes) and this would not look good for the main objectives of ortraying certification, standards and authority. It looks a little fragile.
#23 is much better and interesting. The green might be better with a more bold colour to make a difference. You could try red, blue, orange, purple - whichever you think might work well. the certification mark need to stand out on white paper - the green gets a little lost.