I have a few to post from a couple trips made in the past couple weekends.
IL-76, South
Here's my old photo of the southern end marker for IL-76 from 2010. I like the sturdier setup they have for it now, and your photo, much better!
Lake County A-1, East
I don't normally take photos for the end of county routes, but I thought I would here as I got Lake County's WI/IL shield combo sign as well. Unfortunately, no red arrows on the WI-32 shield.
When I set out to clinch IL-173 in February 2021, I started by driving Russell Road east from I-94, to position myself at the east end of the route. It was a very snowy clinch, giving me very snowy photos of IL-59's northern end marker, and the sign assembly you photographed here. This 32/137 assembly was almost certainly fabricated and erected by Lake County's DOT. I thought it was interesting to see a county in Illinois make an attempt at a Wisconsin state highway marker!
Nice photos! I still need to get to the northern ends of 251 and 75.
Thank you! I've looked through your collection, it's very impressive. I didn't dig too deep though, because I want to avoid spoilers.

I'm not as particular about getting them photographed, but if it works out that I can, I will.
I agree that the newer sign on IL-76 is better. I also prefer the yellow TOLL banner.
I have to give props to Lake County's highway department for taking the time to sign WI-32 (and also WI-31 further west). They've also fabricated signs for a Wisconsin county route somewhere else on the border.