Originally Posted by givio

Yes, teals, aquas, turquoises blend with autumn colors very well! All secondary colors with browns in the mix are lovely for fall. Another mentioned a night sky for a background, which is a fun idea as well. In order for a block to have an autumn feel, probably there should be a mix of colors, not just one color. For example a block that is yellow (gold) and pink (salmon) won't look like fall, but add in olive greens and browns, then it will. Here is a googled image: