The only way you're going to know is by sampling. If you're not already familiar with Samplize.com, they sell peel and stick samples that you can move around from wall to wall. But I've found that before I make a big commitment (whole room if I'm paying someone) I buy a quart and paint a pretty large section (about 8 sq ft) so I get something closer to the full effect. Sometimes a sample looks good, but after painting a larger section I don't like it as much and move on to something else. If you're paying someone thousands of dollars for a big job the cost of a quart is a drop in the bucket. :-) I have seen postings on this forum from people who had their whole house painted and they ended up not liking the color. You don't want to be one of them. And if your rug is relatively new and/or you like it, why not get something that works with it?