In the picture below I have an area of my floor that is finished. However on different parts of the floor, the last owner never finished portions of the floor.
It looks like they just extended the grout(i think its grout) to parameters of the tile. My original idea was just to get caulk and to fill in the areas needed, but wasn't sure how close the color match would be. To give a little back story I'm on a concrete slab, and bugs like to crawl in the unfinished portions of the floor, so I'd like to seal off the cracks not only for looks.
My question is what route would you take in order to get the most consistent looking finish to complete the rest of my floor? Not sure what route to go, and how to get the colors to align. They don't need to be perfect, but hopefully something close.