i can proudly say... i am not very satisfied with this :D bugs are missing few features and if it wasn't for 300x300 challenge limitations, i would make it wider and added third bug to the right... and used more colours... but that's a point of challenge - to be challenging ;]
some tweeking and adjusting is also desirable, but i don't want to miss deadline :]] 
it was quite fun to make, although i spend way too much time on this piece. 

originally in plain greys, then recolored as it seemed to be too dull - here's the greayscale base: humanworlds.org/_temp/3-shades-of-grey---big-base.png