Paprika also turns out yellow to orange.. A bit darker than turmeric, but in my case it cured into more or less the same shade. You'll notice the color
here, on the small soap in the foreground..
Yellow curry powder gets most of its color from turmeric.. Some contain cinnamon. I'd say you'd get yellow to a darker yellow with yellow curry powder but check the ingredients how much is safe to use first.
If you're looking for yellow, the best ones I've gotten are from annatto infusions. I've used it more than once. It's in the same soap linked above. It doesn't fade as quickly as other natural colorants too.
Tomato and carrot puree work, based on what I've seen around here, but I've never tried. Maybe powder will too? If you search here for "natural colorants" a ton of answers you'll get, some with pics.