it is not a simple job to "tweak the color" of something that has multiple shades or multiple colors in it, you are better off having a product database of photos. If you can get a hold of a product database, you *might* be able eliminate a lot of things.
things to cojnsider:
- view angles, view position (is this in any way shape or form 3D, like the Valences or Rods or Drapes?)
- dimensions of window
- it's not going to look perfect without a LOT of tweaking and photoshopping
- drapes, rods, and such products' photos come in the dimensions they came in, not the size you want - more photoshopping (you are simply going to have to squeeze them, I don't think any of photoshop's tricks that I have seen will help here, then again, I am a PS CS5 noob)
- getting photos is going to be a hassle - where are you going to find a lit of 70 different houses to take photos in, and people will allow it? I still suggest a product database from the manufacturers. they may have them online and you simply use some sort of API (Application Programming Interface, in other words, programming software function calls) to access them.
- this is going to require a LOT of testing, tweaking, and debug time, at least for the images.
for me, coding the site would take about 2-3 days max. making it look snappy by paying for and adding stock images would take longer.
I know I could not do this project unless it was a web application. I think I could do a web application. the problem is with web applications there is usually a monthly fee, however, yours would be small enough to not require this, you would be able to do this for free using a .cc or .tk domain and http://www.100webspace.com/ for $0.99/mo with no ads and you get 100MB with is more than enough space for your images and PHP code.
you might even choose instead to host your site on http://yola.com for a more professional look for $349+$49/mo and see if their HP web designers can do the job for you.
working remotely presents challenges. presenting site designs that please the customer may or may not be a simple task. I am NOT a professional Web Designer. I am a Web Programmer and Software Engineer with intermediate web design skills. I can't do this job because I am not licensed for your area, just my area. bummer. I will help you out the best I can.
doing this with a software application (you didn't say windows or mac or some flavor of linux):
+ not taking up monthly money
- maintenance could be a bear if someone changes the API, which might mean it could cost $80 or $800
+ Open Source Software is free if you can get it developed as such, but please be nice and donate to the developer. that's his salary. otherwise, they would have to change their business model. The workman is worthy of his hire.
[- development is going to be long, likely bug-ridden, and expensive. I would not be surprised if you get quoted the price the guy with the first answer quoted.]