stick with the same yellow i reckon.... also... use Verdana as your font and make it a bit smaller, it tidies it up a bit...
id say also put a border on your images that are in the main part... a dark one would work. the menu is grand too... my display is large Resolution, so small size and it looks grand.

do you know what too... coz of the size of the site...it might look good if it opened like this :

http://www.abiotic.net/ click the logo. just a thoguht!!

im puttin 1 together as we speak and i was thinking of having itl like that. ill post up in a bit if i get it online

looking well tho filterz