^^^^
I bet no rice makes a color impact. Colored malts do it by contributing Maillard and caramelization products from malting. Corn doesn't make a beer more yellow than rice, IME. But it would be interesting to hear your results.
What I do imagine would be interesting is trying to get different flavors from, say, Basmati rice, Jasmine rice, etc. Just like corn is a much more flavorful adjunct than plain rice is. Anybody have experience with this?