To see the world in color; a skill:
1. Juicy colors
First idea; look for very juicy colors. The juicer and deeper the color, the better.
To accentuate and exaggerate colors, post-processing is key. I have found that Lightroom CC (the new one) has very good algorithms to process colors to hyper-saturate the colors.
3. Texture and contrast
Also, we perceive colors most strongly when we see a contrast between colors. Colors don’t stand alone; they are always in comparison to something else.
4. Subtle colors
The colors don’t need to be extreme. The colors can be subtle; a pop of color in the midst of a lot of grey.
5. Traveling to colorful places.
For example, Mexico City as one of the most colorful places I’ve been to. It is true; the more colorful the place, the more inspiration you will find to shoot color.
Shooting with a flash will hyper-saturate the colors. If you see something colorful, make sure to also shoot it with flash.
I also am in praise of JPEG; especially when shooting with vibrant JPEG setting filters. Why? Camera companies spend millions of dollars in R&D (research and development) to make their cameras optimized for JPEG. To fiddle around too much in RAW seems like wasted energy to me.
On the Fujifilm cameras, their color JPEG filter presets are fantastic. Ricoh GR II is great in positive film JPEG preset, and I really like the cross process filter on RICOH GR III.