The site looks good. The only thing a more "modern" layout is going to do is draw attention to itself. You don't want to sell web design layout services, you're providing a neutral backdrop to sell drapes and curtains.
Visual merchandising is Not graphic art. What might offend the designer's sensibilities can often have no effect on actual measured customer results. And in fact quite a lot that looks pretty or trendy hurts response.
The RIA -- Virtual Room Designer -- seems well designed. I was able to figure most everything out. However the only way to know is to test ...with real users ...in actual use ...from start to checkout.
For example, I was impressed by the upsell section "Other Customers Have Ordered." Then you went over the top. Rather than "Checkout Now" clicking that button takes the user to another page of additional product suggestions. I think the first thing to test is if you aren't trying too hard there.
The RIA is enough like a software interface that casual forum opinions are not going to help you improve. Sure you'll get comments on the logo, and why everyone's favorite color should now be your site's color scheme. What you won't get is actionable information. And that's what a real user test is designed to provide.
Related:
Why Your Website Doesn't Need To Be Pretty. Looks matter -- a lot. Just not in the way graphic artists want them to.
Visual merchandising is everything graphic art is not.