How to make my scrambled eggs more yellow?
Ah, we consumers and our expectations:
Egg yolks are yellow. 

But in reality, yolks come in a range from pale yellow to deep orange. The colour is determined by the food (wheat makes lighter yolks than corn, for example) and can be influenced by feeding  "colourants" for a darker hue. Some regions allow even artificial dyes, but a pinch of paprika will do nicely. Apparently the "expected" or "preferred" yolk colour is also a cultural thing, I found a source claiming that European customers want more orange hues while US customers expect deep yellow. 

Organic and free-range eggs typically have a greater variation than those from large agro-industrial production. 

So if your scrambled eggs are sometimes lighter, sometimes darker, either accept it as "natural" or check the colour of your yolks when you crack the eggs and for pale yolks add a colourant like a small pinch of 


turmeric (what makes curry powder yellow) or 
paprika (for more orange eggs). 


If you use only a very small amount, it won't influence the taste or only very slightly so. Stir the spice in, then proceed as usual.