Yeah texture for sure. Check out
http://subtlepatterns.com/ for all your texture needs. Then just photoshop color into them and away you go. I use that website a lot at work since they are free and available for commercial use.
I like the color changes for sure. I think if you are going for old antique look you should change the texture in the top to a grunge feel instead of the pixelated look it has now. The great thing about
http://subtlepatterns.com/ is all the patterns can be repeated and look great so it is easy to transfer that to development without having to use a large image.
Two small things I noticed:
The arrow designating what page you are on should be the same color as the cart button at the top right. I think that will integrate it a bit better.
The 'TO TOP' button in the bottom right doesn't mesh well with the rest of the theme. I looks too perfect and crisp to blend in well. I think if you made it look more like the banners you have for "blueprints" and the navigation it could be stronger.
I like the improvements you have made so far though.