The Image Search Options Firefox Extension has now been 'ported' to chrome! I use ported very loosely, as this was effectively a complete rewrite, and the two share absolutely no code... Somewhat annoying... >_<
This extension is more in line with v1.x of the Firefox extension, it does not yet have anywhere near the same level of extensibility as v2.x, and due to the huge limitations placed on chrome extensions when compared to the complete access provided by Firefox, it may never get there. I'm fairly new to chrome extensions so we'll just see how it goes.
Image Search Options for Chrome