The lake is visually stunning and unique, and really has to be seen in person to truly be appreciated. I made an audible gasp when I caught my first glimpse of it's surface color. Over the next hour or so, as more and more of the lake was bathed in sunlight, it turned into a slightly milky-turquoise color and was beautiful to behold.
Here's the best photo I took:
What's fascinating is that Blanca is the only lake in that area with that unique color. Check out my ascent map, and you can see many lakes in that area, but only one is green:
The explanation for the lake's color is glacial till, which is loose rock and minerals underneath the glacier that are picked up by glacial melt and deposited into the lake.
I found the hike itself to be very un-noteworthy for the first ~two miles (it's just a bunch of rote switchbacks along a well-maintained trail), but once you get up on the ridgeline that takes you to the lake basin, there are some decent mountain views and the overall scenery along the trail is lovely (there are grassy meadows, and blueberry bushes, and it's just very verdant and alive).
Here is my ascent and descent. This one is described as "draining", but I found it to be fairly straightforward. It's only 2,700' of elevation gain on the ascent and 650' of gain on the return[1].
The lake is incredibly unique. I took a bunch of photos to try to capture the color as best I could. The initial photos are early (9:30am), and the later ones were taken closer to 11am (and there was a lot more sun).
Note: all images are clickable for higher-rez versions, and the left-arrow and right-arrow keys will allow you to peruse all images. The ESC key closes the preview window.